Did you perchance mean should have?
Definitions
Wiktionary
- v. Common eye dialect spelling (representing a mispronunciation) or misspelling, of should have or should've.
Examples
“That’s what comes of sinnin, an neva doin what she should of …”
“At night, after I had eaten a cold pullet, I walked by brave moonshine, with three or four armed men to guard me, to Redriffe, it being a joy to my heart to think of the condition that I am now in, that people should of themselves provide this for me, unspoke to.”
“Feniton was a thorough home, and already Coley's vision was, 'When I am vicar of Feniton, which I look forward to, but with a very distant hope, I should of all things like Fanny to keep house for me till I am married;' and again, when relating some joke with his cousins about the law-papers, of the Squire of Feniton, he adds: 'But the Squire of Feniton will be a clergyman.”
“For the myth, or saying, or whatever we ought to call it, has been plainly set forth by priests of old; they have pronounced that the justice which guards and avenges the blood of kindred, follows the law of retaliation, and ordains that he who has done any murderous act should of necessity suffer that which he has done.”
“After the first bombshell solution - a proposed solution - to a crime that had had half the country baying for blood (but not Ellis's blood, no no, it was unthinkable), there had been the first court appearance, the remand into custody (a scandal, he should of course be let out immediately on bail), and after that there had fallen a sudden press silence, while the sub judice law came into effect.”
Lists
These user-created lists contain the word ‘should of’.
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Alternate spellings of something.
sxsw, completly, could of, would of, should of, mathhole, h'orderves, breaks, youse, Filthydelphia, frikkin
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Words to torment grammar nazis with
irregardless, alot, grammar nazi, Internet, hopefully, alright, Promptorium Parvu..., Begging the question, begs the question, living language, would of, should of and 5 more...
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Mother, the gun.
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lissa88's list
jabberwocky-like words and things to make u go "huh?"
flamboozle, in one fell swoop, befuddled, shanghaied, bass ackwards, real quickly, should of, orwellien, snozberry, on the bus
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fingernails on my chalkboard
aka malapropisms that drive me crazy
touch basis, irregardless, secure deliverly, should of, heighth, asterix, sherbert, nucular, ekcetra, suppose to, for all intensive..., kerfluffle and 9 more...
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Why Can't People Pronounce These Prop...
Words that make me crazy when people say or spell them wrong. You don't know what it took out of me to type them this way.
See another (kinder, gentler) list "Unexpected Pronunciation"...supposably, irregardless, utilize, warsh, nucular, expresso, guesstimate, inneresting, aks, for all intensive..., heighth, excetera and 45 more...
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Lost battles
Come on, it's time to give up the stickler's fight regarding these words/usages. They've long since entered the mainstream of English.
Tweets
Looking for tweets for should of.

alexz Googlefight says that the ratio of 'should of gotten' to 'shoould have gotten' is around 1:1
http://googlefight.com/index.php?lang=en_GB&word1=should+of+gotten&word2=should+have+gotten
In fact, 'should of' is 'winning'.
Mar 12, 2013
fbharjo wood halved (would have) - an unnecessary bifurcation?
legendary sites (sights) are legend! Mar 11, 2013
ry I will accept it as a real word/construction when in non-formal writing its usage vs. the standard usage exceeds an arbitrary ratio...say 24:1. Which I give even odds of happening by 2050. Mar 11, 2013
bilby Qualifies it as a coprolite, but that's about all. Mar 11, 2013
alexz "Should of gotten" is over 52 years old now. http://goo.gl/ANO1D
It's time to accept it as a 'real word'.
Mar 11, 2013
qroqqa I would have though the common pronunciation is indistinguishable between 'of' and 'have': [əv] is the normal unstressed form of both words. 'Have' has an alternative, less common unstressed form [həv], particularly in England, but this sounds very unnatural to me after another modal like this.
The test is in those situations where modals assume their full forms, that is finally with the rest of the verb phrase omitted: 'They said I won't make it, but I will'; 'You think I can't win, but I can', etc. Problem is, 'should[əv]' is usually repeated as a whole: 'You shouldn't have done that, I should've.' So this wouldn't usually tease out whether the word was an underlying 'of' or 'have'. That said, I have sometimes heard people use a full-form 'of' here. Feb 27, 2009
super-charolastra This is one of those where the misspelling more accurately reflects common (I would say accepted) pronunciation than the correct spelling. That doesn't mean it should be misspelled; it just can't be counted as a mispronunciation. Feb 27, 2009
arby Or should have if you're writing in a formal or business context. My boss uses this all the time, it is agonizing. He's British, so in his accent it might sound more like it, but still. Oct 29, 2007
chained_bear It's "SHOULD'VE," for god's sake... Feb 23, 2007