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1.
A painful zit, or pimple that is located on your butt crack, sometimes premature and very difficult to get rid of.
I couldn't sit down comfortably or get any sleep last night because of my Zass. I wish they made neutrogena Zass cream.
by Dr.Ed August 17, 2012
 
2.
Licking a black girls ass hole when she has the runs to get her to stop complaining about the pain
I had to zass that bitch to get her to shut up!
by Cheereo59er December 13, 2004
 
3.
Translates to "Thee Ass." If someone has a nice ass..it abbreviates to Z.
Look over there, that girl has a Z!
by Maggie K May 08, 2005