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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.
Zass by Dr.Ed August 17, 2012
Related Words
Slang for a person giving next level sassiness.
Joe: Watching the news again?
Jane: Well, changes often you see, sometimes every hour
Joe: I don't need your Zass!
Zass by MrZassy December 21, 2016
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!
zass by Cheereo59er December 13, 2004
Fucking someone in the ass in a 'Z formation'
Max got zassed so hard by maggie
Zass by Hydrocanon 2727 November 4, 2016
A Zasso is a fcking kick-ass person who is just THE shit!
Guy 1: "man look a those cool ass people over there"
Guy 2: "yea...they're the zasso's"
zasso by john11! February 23, 2011

acting Zassy 

to get offended by something insignificant or for no reason at all
Because someone didn't ask politely enough, John got annoyed. He was acting Zassy.
acting Zassy by Zassyboi May 1, 2016