When a person, usually overweight, has large amount of fat under there chin resembling extra chins. A quad chin is two double chins combined.
Her: Holy crap, that fatass has a double chin!
Me: No, all that layer of chin is a quad chin
by ablaz3d February 9, 2011
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When yo balls hit the girls chin when she sucking your penis
Hey Stacy guess who got an quad chin last night!?
by MyPseudonymStolen November 20, 2018
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