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Ninja Cum: (1) The act of cumming inside of somebody without them ever knowing. (2) Also, the act of cumming on an unsuspecting victim without them knowing.
(1) Girl: Well that was fun, sorry you didn't finish Guy: I liked it ... one week later. Guy to Friend: I totally ninja came (past tense of ninja cum)

(2) Person 1: (time to ninja cum) *jerk, jerk, jerk* Person 2: *yawn* Person 1: *SPPPLOOOOOOSSSSHHHHH* Person 2: *yawn* Person 1: *silent zip* well, see you later. Person 2: bye
by will foster April 14, 2008
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2
Ninja Cum (verb) is the wholesome act opon which a man sneaks behinde a unknowing victim (usually female) to simulate the characteristics of a ninja. Than proceeds to ejaculate over the unknowing victim,

then vanish to avoid atention of the victim to the next target.
Example

Guy1: "Dude, you should totally ninja cum that chick over there!"

Guy2: **Sneaks to unknowing victim then ejaculates all over her then get away without being noticed**

Her: "Like OMG WTF, Who just cummed all over meeee!"
by TheRealEnglishMan May 29, 2019
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