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Refers to the period of time immediately following sex in which a woman may lay on her back with her legs up in the air to keep the sperm inside of her vagina in an attempt to facilitate reproduction.
I'd make you breakfast right now but I'm in sperm jail for the next twenty minutes.

Hey, can you get me a magazine so that I can read something while I am stuck in sperm jail!
by Daytime Neologist December 15, 2010
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