egg in (your) beer

egg in (your) beer

Something for nothing; a free, unnecessary, or unmerited bonus or favor. Most often used in the phrase, "What do you want, egg in your beer?" as a retort to someone who gripes or complains about something for which he or she should already be content. Your parents paid for your college degree and now you're moaning that they won't pay for your rent? What do you want, egg in your beer?
See also: beer, egg