another name for a girl's period. This is because your periods can sneak up on you out of nowhere like a ninja. The red's because of the girl's period.
Girl 1: ugh! The red ninja caught me today!
Girl 2: Was his name (t.o.m.)?
Girl 3: yup
by xoamrc November 02, 2009
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Slang for Triple C's, aka Coricidin Cold and Cough. Contains DXM and will mess you up.
Ryan: Ouch, did you feel that?
Tom: No dude, what?
Ryan: That red ninja just kicked me.
by Ryan C March 29, 2004
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When going down on a girl and in the process she starts her period, unknown to you.
"Jane forced him to munch the rug last night and he ended up looking like a red lipped ninja."

"Bobby was going down on Sarah when she totally red lip ninja'd him. What a bitch."
by thatoneguyuno May 10, 2010
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