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1.
A knife fashioned in prison using successive layers of phone book pages soaked in one's semen. A Jizz-Shank is made over several months or years, usually. It generally takes about one night for a layer to dry.
I's gonna stab Marty in the lunchroom with my "Jizz-Shank!"
by Nico Nico Nico January 12, 2008
 
2.
To suddenly thrust inside an orifice as the first hot load explodes out of the penis. Multi-jizzshank is to thrust inside multiple orifices as each ejaculatory explosion occurs.
Last night, after pounding that hot bitch for an hour, I jizzshanked her in her ass as I was cumming. It resulted in the hottest creampie I've ever seen.
by denalipark August 21, 2009