BEGINNER BLOGGING 101 -- Covers basic HTML, Memeorandum, trackbacking like a mofo.— The Other McCain
It's the sound of endorsements been dropped like a mofo.— digg.com: Stories / Popular
Only it split like a mofo, which annoyed me to no end.— the Akamai Knitter
"I can't get enough, ever since my neighbor's kid showed it to me," Jones said, before crooning a few lines from the song: "I'm on a boat, mofo, I'm on a boat, mofo."— RVABlogs
I know Tiger's a bad mofo, but I thought knocking down a block of plastic from 10 feet on the first try was impossible.— YOU BEEN BLINDED

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Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a year.