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1.
phrase describing the action of covertly setting money in a tip jar before anyone else has left "real" tips in order to ease the flow of tips by making customers feel more at ease with the idea of leaving money.
bar band member: "We'd better prime the pump before the crowd gets here tonight."
by Taters1985 January 13, 2009
 
2.
To engage in fellatio without producing an orgasm, as a precursor to other sexual activity.
Go on down down to prime the pump first, dear.
by awhellnaw December 31, 2007