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When your brains slowly start to deteriorate to the equivalent to poop or stool because you have been away from Sunny too long or because you miss him so dearly. It can only be cured by talking to him or seeing him as much as possible. Long term effects can arise and possible permanent brain damage may occur.

See also "Sunny Withdrawls"
Oh Kristine you must be having poopbrains because you miss Sunny so dearly! It's ok because I do too.

by Daddy aka Spartan Warrior December 19, 2008
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Licking someone’s ass hole, then quickly sucking their cock right after.

Poop Brain.
Hey, Kirsten. Do you think later I can get some poop brain?
by HDCatnip May 14, 2018
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