(simile, slang, North America) Making a start, or departing, very rapidly.
When we heard the police car pull up, we were off like a prom dress.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.