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1 definition by Frontside UpperDecker

 
1.
When you sit reverse or backwards on the toilet and take a dump, or masturbate.
Dude, how did you leave skidmarks on that part of the toilet, were you sitting frontside?
I was definitely frontsiding that shit!
I frontsided the shit out of my neighbors toilet!
by Frontside UpperDecker November 21, 2012