Top Definition
A musician vigorously rubs his ass crack and ball sack sweat all over your gear out of spite and jealousy.
Watch out, or i'll buttjunk your shit!

Matt put his buttjunk all over my pedal!!!

I smell buttjunk.

Yes, could i please add some buttjunk to my bass?

Bitch you just got buttjunked!

Man, my buttjunk is fresh today! Who wants some?
by Rachelcuda December 17, 2011
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to get cummed up the ass
i got BUTT JUNKED!
by superduperdooperpooper October 06, 2003
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Buy a butt junk mug!