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
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Someone that you talk to, to your convenience while you are in a relationship. No strings attached, no stress, no expections, no bullshit.
My boyfriend is working my last nerve, I need to talk to my side piece.
by oxjei August 21, 2015
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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
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A girl or boy you speak to on the side because you do not have time for a boyfriend or girlfriend
Friend: hey man, what's up with you and amy?
You: aw man, she just a side piece, i have to focus on the books
by Aka437 December 19, 2017
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February 15th The day men take there side piece(the other girl he is dating on the side) out as if it were Valentines day.
Tommy bought 2 bouquets of Roses One for his girlfriend on Valentines day and one for his side piece on side piece day.
by Onblast! February 14, 2011
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