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Like a hangover, jizzbrained is the low, tired feeling from after sex, usually accompanied with a want for sleep.
Jane must have had a good night last night... she looks completely jizzbrained.

Man, I just had makeup sex last night... I am so jizzbrained. I'm going to go home and sleep. Catch up with you guys later.
by A Friend Of Tyler Durden December 23, 2009
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