Top Definition
The act of placing your testicles on the chin of your partner, whether during fellatio, receiving a rimjob, or as a simple prank.

Can also be used in the past tense as: Chinstrapped.
1. Jill got chinstrapped at the party last night.
2. I heard Jack likes chinstrapping Gina while she licks his b-hole.
by Mr. Phx February 07, 2013

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