you can't dance at two weddings (with one behind)
proverb You cannot do or accomplish two things simultaneously, so you must be decisive in choosing or pursuing one. From Yiddish. ("Behind" in this instance refers to one's buttocks. Other synonyms are often used, such as "rear end," "tuchus," "tush," etc.) The Prime Minister will have to make a decision on how to deal with this soon. You can't dance at two weddings with one behind. Look, either be with me here, or go take the job in London. It's your choice, but you can't dance at two weddings. I'm afraid you'll have to choose between playing football or being in the school band. Both require too much extracurricular time, and you can't dance at two weddings with one tuchus.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.