1.An offer of a private bargain, especially a request for sexual relations.

Origins: this girl who had liked this guy asked if she could use his shower, only to come out of the shower, drop her towel and "request sexual relations".
misha: "Enough already, you have to tell him you like him."
jane: "I know. I'm gonna drop the towel this weekend."
by mo-a February 8, 2005
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Originating in California for an awesome, often sudden, happening, often a climax. Terminology comes from common sexting images where the subject teases with a loosely arranged drying cloth before they 'drop the towel'.
"Man, that band last night were good but on that last song they really dropped the towel"
by tmanthebean August 9, 2015
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