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1.
<noun>

Any guy or girl that you fuck with on the side while in a relationship, anyone other than your significant other. Side sauce commonly does not know you are in a relationship or thinks that you are in a relationship with them.
Heather: "Who's the linebacker with the pretty mouth, is that your boy?"

Crissy: "Nah he's just side sauce."
by The Heatha February 02, 2009
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