To take, without asking, something that if you would have asked, the answer would have been yes.
Note: This is a slang expression popularized by Bob & Doug
MacKenzie's Strange Brew Soundtrack album
Literal usage: "I
horked a beer from your
fridge."
Common usage: "Can I hork a
pencil?"
Note: the common usage is ironic, because you are asking when the definition involves not asking.