Feed up Definition 1 of 2Pro Tip 1/3Emotional Tone Expresses strong negative feelings about a situation that is intolerable. She was fed up with the constant delays. Pro Tip 2/3Duration Implied Suggests patience has been worn down over a lengthy period, not quickly. He's fed up with the years of poor service. Pro Tip 3/3Colloquial Usage Common in informal conversation among friends or in private settings, not formal occasions. She told her friend she was fed up with her job.