How Well Do You Know English Slang?
late 14c., mocchen, imitative (cf. crunch), or perhaps from Old French mangier "to eat, bite," from Latin manducare "to chew." Related: Munched; munching.
Exploration of security holes of someone else's computer for thrills, notoriety or to annoy the system manager. Compare cracker. See also hacked off. [Jargon File]