Top Definition
When you have diarrhea so bad it drives you insane. You foam at the mouth and are afraid of water.
Ron: Hey Harry, what's wrong with Seamus?

Harry: I dunno, friend, he's been acting mad all day!

Hermione: Watch out! He has diarrabies! We have to put him down!
by EthelPeeJones October 02, 2011

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