1. when the computer application you are developing or testing is no longer working as expected.
2. when the server is no longer responding (not application related)
(when a server doesn't respond) "I think the server is horked..."
to quickly eat.
to vomit or belch in a manner like that of vomiting.
to steal or pilfer, usually pertaining to items of little value.
screw up, make dysfunctional
to sell (a bastardization of *hawk*)
do (can mean essentially anything)
Note: This is a slang expression popularized by Bob & Doug MacKenzie's Strange Brew Soundtrack album
Common usage: "Can I hork a pencil?"
Note: the common usage is ironic, because you are asking when the definition involves not asking.