A Fucking Retared Moron Whos Always Watching Porn.

When you eat dirt for the first time and leave your family to build a shack in the woods

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.

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

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'.