Reddit reviews Dirty Sign Language: Everyday Slang from "What's Up?" to "F*%# Off!" (Dirty Everyday Slang)
We found 1 Reddit comments about Dirty Sign Language: Everyday Slang from "What's Up?" to "F*%# Off!" (Dirty Everyday Slang). Here are the top ones, ranked by their Reddit score.
Yes. There's even books like THIS which talk about it.
I'm sure you could search on YouTube for "sign language slang" and find some more explanations, too.