The intellectual goo that is secreted in the hypothalmus when one experiences an epiphany leading to euphoric pleasure (also known as braingasm).
Dude, when I saw that kitten, I realized the meaning of life, and I got brain jizz everywhere.
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verb. When you're deep throating a betch and you dick goes up instead of down and you ejaculate all up in there brain
Oooh I was with James last night and i totally jizz-brained his betch ass.
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When you put the tip of your dick in a girls nose and ejaculate onto her brain.
While she was sleeping I wanked in her nose and gave her mad jizz brain and she might die.