When a severely drunk and/or hungover person is trying to vomit into the john and they tip forward thereby taking a "Johnny Dipp". Extremely gross if there is any vomit already in there!
PETER: God damn, Greg, what happened to you?

(Greg has water and barf all over his hair and dripping down his face and body)

GREG: I was puking into the john and I fell forward!

PETER: Well, get into the shower and clean up! Don't get your Johnny Dipp all over my house!
by Bobby Brady June 24, 2006
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