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A straight up mutha fucka who goes up in the rectum, starts pounding and doesnt quit until the sun comes up.
Damn they've been poundin the ass all day, they must be rectum riders.

Someone who penetrates a chili whole.
by Corey Trev May 30, 2011
Gay man, one who rides another man ass, with penetration.
That guy is staring at my ass, he must be a rectum rider.
by RJohnson November 14, 2006