A blend of two words - bun and anorexic.
1: Bun (adj.) - ugly, unattractive
2: Anorexic (adj.) - suffering from anorexia, an eating disorder

Bunorexic is where somebody has become so skinny that they are now unpleasant to look at. Can also be used in a wider sense to describe anything unpleasant.
1: Check out that girl, she is sooo bunorexic.
2: Someone's pissed on the floor, that's so bunorexic!
by Bunorexic comes from Essex, ye October 19, 2010
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