The meaning for Glitch; Any Error, Malfunction, or Problem. Also known as a Bug.
Well, it would go under the cheat forum, because we got a place for walkthroughs and cheats, why not glitches?
How will it help ArcadeTrainer Forum? Well, people can post the glitches they find for a game that they can use to an advantage. For example; Do this, this, and that and the game will glitch and you will have 50,000 gold.