off like a prom dress
English
Etymology
Pun on two senses of off, with the implication that a couple at a prom are likely to have sexual intercourse.
Adjective
off like a prom dress (not comparable)
- (idiomatic, slang, Canada, US) Making a start, or departing, very rapidly.
- When we heard the police car pull up, we were off like a prom dress.