A chinstrap is when kids grow a beard and wear a hat 24/7. So, it appears that his beard keeps his hat on his head.
Yeah, I know who you're talking about; the guy with the chinstrap and the non prescription glasses.
by nolipz the midnight marauder October 23, 2003
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During the performance of oral sex on a female, a bearded male will place his chin between the vaginal lips and shakes his head back and forth rapidly and lightly to induce a pleasurable experience for the female.
Shirley loves it when she gets Chinstrapped by John.
by Joey from AU November 22, 2007
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To be 'on your chinstrap', means that you are knackered and absolutely positively cannot go on. You're fucked up good and proper.
Military Slang.
"I can't go on, I'm on my chinstrap here."
by Diego July 29, 2003
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Incarceration Term-
A hard and heavy blow the chin as a form of minor punishment in prison/jail. Usually given for minor incursions. A head will tell a torpedo to administer the chinstrap.
Johnny Boy lost two of his teeth last night when our head told a torpedo to give him a chinstrap.
by Fumanchewd October 26, 2006
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When one is inducing orgasm using the art of titty F*cking the final "blow" is produced by extreme pressure causing the seminal fluid to spread across the partners chin causing a "strap" affect.
Other known uses:

1.That guy is such a chinstrap.

2. I just wen skiing on chinstrap mountain.
by Jonathan April 22, 2005
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When someone rests their chin on a man's testicles while the man repeatedly hits them in the face with his erect penis.
Jim: Hey, can I give you a Kentucky Chinstrap?

Abby: I've never tried it, but it sounds like fun!

(Abby puts her chin on her Jim's testicles. Jim starts hitting her with his penis)

Wife: This... is... not... what... I was... thinking... dammit, Jim!
by The Graham Cracker November 10, 2011
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while receiving a blowjob, the male pulls the excess flesh from his nutsack and wraps it around the girls chin, hence, creating the belgian chinstrap
Me and that girl from the bar got freaky last night and I gave her a Belgian Chinstrap
by Crocodilejohndee December 22, 2011
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