Meaning of goof-up

goof-up

Pronunciation: (gf'up"), [key]
— n. Slang.
  1. a person who habitually makes mistakes, spoils things, gets into trouble, etc., esp. through carelessness or irresponsibility.
  2. a mistake, blunder, malfunction, or the like.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.