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1.
Acquired Immune Deficiency Syndrome-{AIDS}.
"United Nations Peace Keeping Troops have spread the butt flu all over Croatia."
by J.E. Walker April 27, 2003

Words related to butt flu

diarrhea flu illness poop sick
 
2.
When you have diarrhea.
I stayed on the toilet all night because I had a major case of the butt flu!
by SarahH2o October 20, 2008