(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.
Add your own interpretation of "off like a prom dress".
Slang from Black American Vernacular English (AAVE), hip-hop, drag and ballroom culture, the Caribbean, and NYC street vocabulary. The single largest source of new mainstream English slang in living memory.
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