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Similar to a donkey punch with a few twists...

As a man is having intimate relations with a woman's rectal cavity from behind, he reaches over her head, grabs and pulls up on her lips (creating the two tusks) and then knocks her in the head with a truncheon (or other blunt object). This is the most intimate and romantic act anyone can participate in.
Dude, I'm totally in love with her, I'm waiting 'till marriage to walrus flog her.
by J "i am the walrus" Mo February 27, 2006