When you masturbate before your girl comes in so she can find your penis easier in the dark.
In an interview with "Lester Holt," President Trump proudly proclaimed that he invented the phrase stating, "Priming the pump is when I tug on myself for about half an hour before Melania comes in so she can find it easier."
by Bogrimm May 19, 2017
Eating the pussy while warming it up for sex.
I was licking the cho cha trying to prime the pump.
by James March 11, 2003