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 24, 2009
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The severe backup of semen, cum, load, in an ear. Usually caused by a 41 or 82.
Jordan Boehler got fucked in the ear so hard last night he was diagnosed with a severe and possibly fatal case of jizzbrain.
by Henry Finkler April 26, 2004
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when gay men shove dicks in each others ear so much that jizz comes in contact with the brain
mike has jizzbrain
by stinky May 27, 2003
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