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When your penis bends to incredible lengths before inevitably breaking and returning to it's neutral position, mangled and distorted. The name is given due to the snapping noise the penis makes as the muscles tear.
Bro, she was riding me yesterday, but she totally ruined it when she gave me a Snap-Back!

My boyfriend and I had rough, passionate, brutal, ball busting, jaw snapping, snap-backing anal sex yesterday.
by Richar Dick October 03, 2019
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