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1) Ejaculate that ends up in an undesirable location, typically as a result of masturbation. For example, on a keyboard, laptop, computer monitor, a pet. May cause damage and will always require unpleasant cleanup.

2) A horrible person whose conception is viewed as an tragic accident. Usually a total motherfucker and a douchebag and usually a male.

Implies that their father's semen should not have come in contact with his mother's egg for the better good of humanity. Example: Adolf Hitler.
1)
"I just had a major jizz accident. My keyboard is soaked in cum".

2)
"Donald Trump's dad should have pulled out"
- "Yeah, he's such a jizz accident".
via giphy
by alveraan July 27, 2018
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