off like a prom dress

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English[edit]

Etymology[edit]

Pun on two senses of off, with the implication that a girl at a prom is likely to behave sluttishly.

Adjective[edit]

off like a prom dress

  1. (idiomatic, slang, US, Canada) Making a start, or departing, very rapidly.
    When we heard the police car pull up, we were off like a prom dress.