|1.||off like a prom dress|
Similar to "gotta jet" or "gotta bounce", this phrase means to leave somewhere very quickly with speed matching that of prom dress removal at a post-prom party.
Talk to ya later, I'm off like a prom dress.
|2.||off like a prom dress|
departing, or about to depart
As soon as he finished his meal he was off like a prom dress.