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 26, 2004