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1.
Having an indented or "cleft" chin that when you stare at carefully enough resembles the human ass.
I could swear Kevin had a piece of toilet paper stuck to his ass chin. Do you think he can really poop from it ?
by Steve the Kevin Hater October 27, 2007
 
2.
a second ass on the chin
you have a big ass chin
by joe c September 02, 2004
 
3.
Where you have a very deep cleft chin and it looks like a ass crack.
The advantage of an asschin is: you can blow your nose and wipe your ass at the same time>
by asshat January 22, 2003
 
4.
jackass who torments aol chatrooms
damngoodlookin is an asschin
by bobby jane January 18, 2003
 
5.
A fold of fat underneath the jaw line caused by an excess of body fat. Double chin.
"That fat muthafuckah has a humongous ass chin!"
by Tunmy AuGratin February 23, 2006