Examples
“A few additions to Joann Karges '"Rhyme and Jingle": hotchpotch, titbit (source of tidbit), and rumdum.”
“I’m a little rumdum right now, but I’ll try to catch up.”
Firedoglake » Late Nite FDL: FOUND! The Lost Notebook of Ana Marie Cox
“He usually works with a rumdum robot that he built himself. ”
Lists
These user-created lists contain the word ‘rumdum’.
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Sot
a partaker of a dram too many. consult also whichbe's Drunkie list
sot, toper, drunkard, boozehound, tosspot, wino, lick-wimble, souse, lush, alky, juicer, inebriate and 47 more...
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Potpourri
eponymous, aa, pulchritude, gizmo, macabre, sui generis, solecism, solipsism, eldritch, samizdat, queue, obsequious and 469 more...
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Nightmare Alley
From the novel by William Lindsay Gresham
geek, mark, rubber, calliope, booze-fool, rummy, the horrors, the crawling snakes, equalizer, bubbies, grubstake, softshoe and 99 more...
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Just 'cause I like 'em, R
retinol, rectory, rhubarb, rancor, recension, rood, redivivus, roborate, redound, ripsnorting, ragtag, recruit and 250 more...
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Stupidity
calvish, buffle-headed, bedaff, anserine, dasiberd, der-brain, dodipoll, dold, dulbert, gomerel, guffin, hebete and 12 more...
Tweets
Looking for tweets for rumdum.

yarb 'She's a smart dame, all right. Too bad she's tied to a rumdum like Pete who can't even get his rhubarb up any more, so everybody says.'
- Nightmare Alley, William Lindsay Gresham Jun 29, 2012
oroboros Bar rat, toper. "Nearer the main street there were a few tourist hotels with neon signs like icing on a cardboard cake, red-painted chili houses, a series of shabby taverns where the rumdums were congregating."
--Ross Macdonald, The Moving Target Aug 18, 2009