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1.
a "front side" is the forward facing portion of any individual, this is not a gender specific term. it is also a universal term and can be used interjectionally in any sentance or conversation one could be having.
shit girl hide that front side and let me check out your dumper.
by jackattackmcdumper July 11, 2011
 
2.
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