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Named after the infamous host of MTV's Headbangers Ball, a Riki Rachtman is when a person is having rough doggystyle sex, pulling back their partners hair, the indiviual quickly releases his/her partner's hair causing her to bang her head into the headboard.
Friend: What happened to Sara's face?

Guy: She was way too loud during sex last night so i gave her a Riki Rachtman.
by Kefferson Cooper June 12, 2011