Top definition
When a male masturbates, killing countless amounts of defenseless sperm.
Tyler: Duuuude last night I whacked off.

Jackie: Way to go and commit sperm genocide...
by mofo96 June 22, 2011
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2
A swift kick to the bad place.
Don't ask her out, I heard she committed Sperm Genocide on the last guy who did.
by Bobert2350q34 May 17, 2011
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