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. Compare off like a bride's nightie.

Pronunciation

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Adjective

off like a prom dress (not comparable)

1. (simile, 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.