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The act of Jerking off while playing X-Box or any other video game.
My girlfriend left me because she said I was posching off to Halo too much.

After I made the final kill I was so excited that I had to posch off.

While playing Call of Duty I always like to posch off.

My controller is still sticky from when I posched off yesterday.
by legalizeweed April 01, 2010