<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.
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."
Crissy: "Nah he's just side sauce."
by The Heatha February 03, 2009