The act of plowing your whole fist in your sexual partners anal cavity/vagina hole. This is a stimulant in order to make an orgasm of any sort feel better after the act of love-making.
Guy 1: dude I just had sex it was great for us both!!
Guy2: did you use the Oklahoma pile driver?!?
Guy 1: yea I did it worked so well!
Guy 2: well that explains why she liked it so much.
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