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When you ride on public transportation and the seat of your pants gets covered in other dirty bus riders germs.
"Don't sit on my bed, you got mad Bus Butt right now"
by Trashcanshelly February 28, 2015
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2
The rear end of a public transit bus which sticks out into traffic when it stops for passengers, thus rendering cars unable to pass.
"I hate driving in that lane, you get bus butt the whole way!"
"I am going to miss the next light because of this bus butt"
by damoi September 02, 2009
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