Adj. Describes anything pertaining to a thug existence. Created completely on accident, and generaly used when talking about the Grand Theft Auto video game series.
Peep1: "Damn I just popped some caps in dem fools asses in GTA San Andreas fo' sho'!!1"
Peep2: "Wow, thats some hardcore thugery right there man..."
To take something small, that doesn't quite qualify as a theft. Probably from the Danish "skæv" or the Dutch "scheef", both of which are pronounced similarly, meaning "askew, or not quite right'. To change an item's ownership without permission, but only something small and of little worth.
"I skeefed an apple off the neighbor's tree." "I skeefed some chips outta your bag when you looked away." "Don't skeef my chair when I go to the bathroom."