An ad-hoc weapon is anything being used as a weapon that was not designed to be one. This includes using weapons in ways they are not intended to be used, such as hitting people with a rifle butt.
Regardless of the card's keywords, items used in an ad-hoc fashion return to the deck when played. Rotate or Persistent keywords are ignored.
Throwing for Ad-Hoc Items
Occasionally characters will try to throw something that is not designed for throwing, such as a half-brick or a gun. Because these are inherently inaccurate they have the Range (0) keyword.
Unless the action includes other range keywords, every square the object is thrown gives the target a 1d6 situation bonus. This means that throwing an ad-hoc item into an adjacent square has to beat at least a resistance of 1d6 to be on target.
Thrown ad-hoc weapons gain the Discard keyword.