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The action of stealing something of little to no value. Most often when hammered or tanked.
"Dude, lets shit-nick that lamp shade"

"nah, lets shit-nick that shoe horn"

next day...
"why the fuck would someone steal a shoe horn?"
by DMPDpete August 04, 2008
A dumbfuck; a fucknut; someone more worthless than a peso; your semi-retarded brother who likes to fuck pumpkins.
"Close the door, shitnick, you're letting all the flies in!"

"Stop fucking that pumpkin, shitnick!"
by Brendon November 18, 2003