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 ?
מאת Steve the Kevin Hater 27 באוקטובר, 2007
Can you define these popular missing words?
a second ass on the chin
you have a big ass chin
מאת joe c 2 בספטמבר, 2004
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>
מאת asshat 22 בינואר, 2003
jackass who torments aol chatrooms
damngoodlookin is an asschin
מאת bobby jane 18 בינואר, 2003