When you get a double chin after gorging on donuts and fist loads of Red Lobster biscuits.
Yo babe, slow down on those donuts or you're gonna grow a biscuit chin.
by elpulpo June 4, 2017
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The flaky remains of someones genital area left on the chin after a teabagging. Generally looks as if someone has been eating a flaky biscuit and didn't have a napkin.
Remnants of my Chin Biscuit could be seen on her face hours after she gave me the teabagging of my life.

Or

Dave: Man, you need a better moisturizer, your face is all dry.

Mary: (wiping flakes off chin) No Dave, That's just a Chin Biscuit from last nights singles mixer.

Dave: Oh, I thought you were eating potato chips out of the bag or something.
by R.G. Gravymaker July 13, 2010
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