Slang for the head of your penis. If you remove Darth Vader's helmet, then you are masturbating. If you find a place to put Darth Vader's helmet then you are having sex regularly.
- So what did you get up to last night then Steve?
- I removed Darth's Helmet - Oh. So you were on your own then.
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."