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I stayed on the toilet all night because I had a major case of the butt flu!
butt flu by SarahH2o February 24, 2009

The butt flu 

Refering to AIDS, and HIV.
I heard they had a bad case of the butt flu break out over at the Bathhouse.
The butt flu by Shayne B August 9, 2006

butt fluctuation 

the movement of curvy butts when women walk in tight jeans or shorts.
dude,behold the butt fluctuation of that gal in white shorts.

butt fluid 

The gelatinous, viscous, amalgamation of diarrhea and usually seminal fluid that drips from the anal orifice down to the catholic schoolgirl knee-socks after a romping good round of buttsex.
Teacher: What is 3+3?

Student 1: I smell poop.

Student 2: Hey Jill, whats that stain on your socks??

Jill: O no i forgot my butt plug. The butt fluid is a-flowin'.

Teacher: Well, go confess.

Jill: Why? It's the priest's fault for ramming it in too hard.
butt fluid by Barnaby J. August 6, 2008

Butt flux 

The moisture which accumulates inside the crack of ones anus.
Butt flux by Anonymous October 10, 2003

butt-flush 

In poker, the second best flush possible given the situation.
I had the king high butt-flush, but he had the nuts.
butt-flush by benofmn July 15, 2013