A person who makes shit up to be funny, but has no real sense of what is actually funny and/or interesting, and/or worth anyone's time.
"Hey, I'm a fucking jackass, I'm going to go comment on every new youtube video (hopefully with just the word First),then I'll get into an arguement about how much better my country is, probably drop a few racist comments, call someone a fag, maybe imply that someone's mother and I have performed some sexual acts, and afterwards I'll make up stupid shit and post it on Urban Dictionary, or anywhere else I see a submit button!"
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Fucking Jackass is Donkey from Shrek.
Shrek:
No, my swamp
Donkey:
Our swamps
Shrek:
Fucking Jackass