have one's cake and eat it too
To enjoy two opposite advantages.
You can either spend your money going to Europe or save it for a down payment on a house, but you can't do both. That would be having your cake and eating it too.
have one's ear
To have access to someone in power; receive audiences rather frequently.
The national security advisor has the president's ear.
have one's ears on
To have one's CB radio in receiving condition.
Good buddy in the eighteen wheeler southbound, got your ears on?
have one's fill
To be satisfied; be surfeited; be overindulged.
Howard says he's had his fill of expensive golf tournaments in Europe.
have one's fling
To have one or more romantic and/or sexual experiences, usually before marriage.
Jack has had his fling and now seems to be ready to get married and settle down.
have one's hands full
To have as much work as you can do; be very busy.
The plumber said that he had his hands full and could not take another job for two weeks.
With three small children to take care of, Susie's mother has her hands full.
have one's head screwed on backwards
To lack common sense; behave in strange and irrational ways.
Henry seems to have his head screwed on backwards; he thinks the best time to get a suntan is when it is raining and to sleep with his shoes on.
have one's hide
To punish severely.
John's mother said she would have his hide if he was late to school again.