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2.
a girl on the side, a girl you call up at 2am and she knows whats up, no attachments just fuckin', just make sure the girl know she a side piece
Sam: yo dude where you off to so fast?

Dave: I'm off to go poke my side piece nigga!
by gettinjazzy October 04, 2010
 
1.
The other woman. Also see Goomad.
My side piece is tight!
by Louie March 15, 2005
 
3.
a guy that does anything you want that isn't your boyfriend and you can still get with other guys. the best thing a girl can ever have.
c: are you with your side piece?
j: nah im with another guy
by jockin ohyeahhh November 13, 2010