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1.
(leyt nahyt jim-ee)
-noun

1. A nocturnal request or negotiation made forthright with the sole purpose of consummating sexual pleasure.

2. Any person who solicits such a request, not exclusive to a stranger in a seedy location; the verbal contractee could be a significant other as well.
"Hey baby, wanna come back to my place for a late night jimmy?"

"My husband never does anything romantic anymore! All he wants is a late night jimmy."
by Dyslexicon March 28, 2010