Top Definition
the act of ejaculating on someone without the person knowing.
"While Brody was sleeping I was asked by a friend to ninjaculate on his face, covering his whole mouth in my judo sperm.
von ninjaculator 26. Oktober 2009
To ejaculate in such a quiet or subtle way that your partner either barely noticed or did not notice at all.
girl: why did you stop?
guy: rolls off
girl: WTF. Did you cum?
guy: yeah
girl: I couldn't tell. That was quiet.
guy: Like a ninja. I guess i ninjaculated.
von Zublminal 4. April 2015

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