What does 'with egg on one's face' really mean?

[Maron]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #22 "Egg expressions", question 4

First he agreed and then he disagreed. The result was he ended up with egg on his face.

(a) looking foolish
(b) looking serious
(c) looking dirty
(d) looking old

English Idioms and Expressions, Advanced Level

ESL/EFL Test #22 "Egg expressions", answer 4

First he agreed and then he disagreed. The result was he ended up looking foolish.

Correct answer: (a) looking foolish
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What does 'with egg on one's face' really mean?

[Mister Micawber]

Caught in an embarrassing situation.
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Native English teacher at Mister Micawber's