From Discworld MUD Wiki
Like throw, but requires the weapon to be inside a special knife sheathe like a knife belt or wolfskin armbands. Needs a hand empty.
It auto-draws the knife, then throws it.
hurl dagger at burner from scabbard You snatch a black steel dagger from the charcoal grey suede ankle scabbard. You throw your black steel dagger at the blackened charcoal burner. The black steel dagger hits the blackened charcoal burner in the neck.