To aggressively thrust your pelvic region forwards (and sometimes backwards).
Man, MC Hammer sure is powerthrusting in the video for "U Can't Touch This".
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During anal sex, when the man moves to the other side of the room, takes a 15 metre running start, and thrusts into his partners ass.
"Woah, my ass hurts today."
"Why's that?"
"Last night my boyfriend tried out the Pickering Powerthrust"
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