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Masturbating and shitting, preferably with runny consistency, simultaneously while lying in such a position that the feces trickles back over the penis, and runs off the penis onto the masturbator's face and mouth. The masturbator then ejaculates onto his face and mouth to conclude the act.
My girlfriend gets so horny when she watches me opening the yak.

My mom kicked me out of the house after she caught me opening the yak on her dining room table.
by Yakkman November 04, 2009
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