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1. The substitute for Jackass. After various scientific studies, it has been found that Jack, is actually a really nice guy.

2. a cold-hearted, morally ambiguous, obnoxious, potentially evil bastard, bent on ruining your day.
What a fucking ZACKASS!
Zackass by Jmvghwonwotcons June 20, 2010
Related Words
Zackass: an internet troll whose opinions are always more equal than others; one who will put you down because he has 'served his country' and believes that you have not; one who will never admit he is wrong, despite overwhelming evidence to the contrary
just because your opinion differs from mine does not make it better, or more valid; stop being a Zackass
Zackass by heywood jablome April 26, 2007
Having extreme qualities of what it is to be a jackass, or something close to it. If someone around you is fucking around and acting like a dumbass, refer to him as a 'zackass'.
'When we were washing cars for a school fundraiser last weekend, I told Zack to go and get the towels, so he decides to dance on them. *facepalm* what a zackass.'
zackass by xxxmaddiexcore April 15, 2009

Zackass Linarass 

has rough monkey sex with mikalya everyday in the back of Irvine as well as well as beating the fuck out of mr chan
Logay: that guys a real Zackass Linarass

Kelton: ya tru I hate that he fucked that bitch
A person named Zach that has a tendency to behave foolishly, thus making him a jackass.
Mariah: Remember Zach from online?
Alex: Oh, yeah! He was such a zachass!
zachass by That Kathryn girl September 3, 2008