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When you are receiving a blowjob and whip out your dick to start slapping your girlfriend in the face as fast as possible, making a sound like you are flipping flap jacks.
Bro, my girfriend was giving me a blowy last night and I just started doing the Oregon Slap Jack on her for no reason.

Thats phenomenal bro.
by BigGayScoob March 19, 2016
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