Any legal substance used to improve or enhance the mood of your date. Something that gets your date to open up.. be it her/his mouth; for converation or his/her legs for fornication. A situational substance that removes the friction from the dating process.
She was silent and stoic until we went to Jake's for some social lubricant. After two drinks we were talking about our parents and dancing like it was 1999.
liquor of any form that induces intoxication and social lubrication (i.e., outgoing and gregarious behavior)
I gotta hit the social lubricant before kickin' it at the club.