The act of swapping stored sauce in the mouth while making out.
Boy- *has Buttermilk ranch stored in his mouth, then proceeds to make out with his girlfriend.

Girl- *has ketchup stored in her mouth, proceeds like make out with her boyfriend

While the two are making out, boy trades his sauce with his girlfriend. Boy now carries ketchup in his mouth while his girlfriend carries buttermilk ranch. This is the act of a sauce swap

The two continue their day and venture on to Costco for the free samples.
by Savitar Slayer January 10, 2019
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Yeah dude, last night I was totally swapping sauce with that babe after we went to another room.
by c0smic September 19, 2013
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I would love to see Katie and Camryn Swap Sauces one day
by AtomicNarc August 11, 2015
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