An ignorant, slow-witted person who loafs around the local scene trying to get wasted, repeats whatever you say to everyone and gets themselves arrested on the regular for things most folks are smart enough not to get caught doing. Usually people just leave them be except for the cops, who they always manage to piss off.
"yo, this dude has got a big mouth!"
" nah, don't even worry about it. He's just some shitwhacker I see here all the time. Pay him no mind. Last week he got arrested for pissing on a cop car then asking the cop if he had some paper towels so he could dry the piss off his shoe."
The origins of this term come from Jim Lahey of the Trailer Park Boys, a Canadian television show. Shithawked is a verb meaning you got completely blackout, coma drunk last night and maybeeven wound up in the hospital.
"Hey Steve, how was your night out last night?"
"I got absolutely shithawked, how was yours?"
"Hey Steve, how was your night out last night?"
"Don't remember, the shit hawks got me last night!"