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noun: a fart that creeps it's way up thru a female's genetalia which upon escaping makes a distinct and crisp popping noise. Refered to as a "TB" for short.
"I was sitting in my Calculus class when I sneaked out this huge fart. I thought all the air had dissapated, but when I stood up I let out a loud tush bubble."
by I'm a girl...really. January 25, 2004