Top Definition
1. the act of intercourse in such a way that the female does not know it is happening.

2. the act of intercourse in such a way that the female does not know that you're coming (see what i did there?).
g: how did you get me pregnant? we didn't even have sex!

b: i used my ninjercourse on you, baby...that's how i roll.
by Big McLargeHuge July 11, 2006
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