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1.
1. The act of ejaculating (jizzing)on a person without their knowledge.
Dana woke up with goop on her face and accused me of ninjizzing on her.
by Octohog May 19, 2010
 
2.
1.(n) Man-sauce of a ninja.
The ninja popped like 16 boners, bigger than the biggest blackest boners alive. The each shot out flowing streams of ninjizz and made whistling sounds too.
by Luvnuts March 03, 2003