Egg in (one's) beer American noun phrase
The phrase can be understood as a metaphorical expression for somebody who has almost everything, but he or she still wants more and more. This phrase is often used in the sentence "What do you want? Egg in your beer."
Stop complaining about your wage, Keith. What do you want, egg in your beer?
Even when she's risen to fame, she still wants egg in her beer.
A desire to do something, which is random, sudden and unaccountable
To long for something/ to do something
Believe or act in accordance with your desires, usually in spite of the wants or feelings of others
Used to emphasize one's interest or eagerness to have or do something
This expression dates from about 1940 and became widespread during World War II. The origin is unknown, since adding egg to beer does not improve the taste.