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17.
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
 
1.
A patch of hair grown on the chin that looks like a chin strap for a football helmet. Similar to a goatee.
Jimmy was so proud because after months of practice, he was finally able to grow and perfect his chinstrap beard.
by Michael Eric Brown May 27, 2005
 
2.
Refers to the style of facial hair given instantaneous worldwide prominence in the wake of Whitey Ford aka Everlast from the Irish rap group House Of Pain. Pencil-thin crawl of hair alone the jawline,optionally including moustache with demerit points. Who sports the Chinstrap: Everlast,Gotti boys,50 cent,Norte Dame Fighting Irish Leprechaun,Italians,Irish,White Boys,Latinos,Blacks and so on. Better term: Chinstrap Beard.
1. Yo I can't see my girl yet I got to get my chinstrap lined up and get my hair faded.

2. Yo who changed my settings on my facial trimmer?

3. Yo Vinnie when is Joey going to get out of the bathroom he is trimming his chinstrap but he has been in there for an hour now.

by bigryhn October 27, 2005
 
3.
A douchey beard style, favored by guidos who want to make their steroid-infused jaws appear to be at a 90 degree angle. One of the top 5 worst facial hair styles to have, according to most women.
Guy 1: Check out that fucking douchebag with the chin strap.

Guy 2: Holy crap, that's douchey.
Douchebag: WUT U SAY?! /raaage
by Smatchmo the Trumpeteer April 26, 2010
 
4.
The facial hair that connects from ur side burns that is lined up all the way around.
Yo,i don't feel like shaving so lets hook up these chinstraps.
by Euroman February 25, 2005
 
5.
To have sex with another man and blow your load on his massive chin
I gave Jeff Pashko a serious chin strap last night.
by panheaddan March 09, 2014
 
6.
According to Murphy from Sealab one could assume that chinstrap means:

1. A jerk
2. A jock
3. An asshole
4. Anyone you do not like
5. or anyone named Marco
::punches guy in the face::
"How do you like me now, chinstrap!?"
by l=f(d) April 06, 2006
 
7.
Use instead of saying "chinstrap beards or stalkers with chinstrap beards"
Dude: Mike is such a fucking little Chinstrap biacth!
Bro: Yeah he followed us around and his creepy Chinstrap rubbed on my arm, ewwww!
by chinstrap May 01, 2009