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When during anal intercourse you urinate inside of your partner. Yellow and brown like a dirty schoolbus.
She was totally pissed when I gave her the dirty schoolbus.
by Mogged March 09, 2008
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When a guy shoves a twinkie up a girl's asshole and then ejaculates on it. Afterwards, he gets another girl to eat the twinkie out of the other girl's asshole while on a schoolbus. The girl with the twinkie up her asshole then proceeds to finger her asshole and then eat the sperm and twinkie from her fingers.

Kid: Wanna get a dirty schoolbus?
Girl with tight asshole: Hell yeah! I love twinkies up my asshole!
by Average Kid December 08, 2016
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