What does fed up mean?

[mytran]

English Language Tests, Intermediate level

ESL/EFL Test #273 "When do you say this?", question 2

I say "I am fed up" when I ..........

(a) am angry
(b) have eaten too much
(c) have had enough

English Language Tests, Intermediate level

ESL/EFL Test #273 "When do you say this?", answer 2

I say "I am fed up" when I have had enough.

Correct answer: (c) have had enough
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what does "fed up" mean?

mytran

[Conchita]

The test sentence is self-explanatory, Mytran. Perhaps we could add that 'fed up' is informal for 'bored' or 'tired'.