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Sliding naked into your flat mate's bed when his or her partner is already there and waiting for your flat mate to return, then preceding to snog them. Lastly, post coitus, you must shout, "Oi gov thanks for givin me the ol sneaky swap!"
"I was about to get it in with this hot chick but after sex, I realized my roomie got me with a damn sneaky swap."
by Tankkard December 25, 2013
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