A very oftenly used insult used by the immature population. Other more adult versions of this are examples such as Jack Ass, or plainly Ass. "Jack" is heard to be a old famous donkey from medevial times, and a munchie is that pesky little green man that is used in the old game by Macintosh called Super Munchers
Dizzy Muchies is when your drinking alcholic beverages while simultaneously smoking Marajuana. You tend to get dizzy do to alcohol while very hungrey do to weed.
I totally got the dizzy muchies last night at Danielles party! I ate eveything in sight, while being drunk as fuck!