When a doop is being a poop. Rather gay, also can be a "doopypoopy" when the doop is watching youtube and the black men are shaking it. (When you see a doopypoopy just yell "doop doop doop!")
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."