A girl who seems sweet and loveable and awesome when you start dating her, but turns out to be a bitch later, particularly by cheating on you.
"So, how are things going with you and Lisa?"
"Oh, we broke up man. She turned out to be a complete ninjabitch-- She fucked my best friend and didn't tell me for three months."
"Oh, we broke up man. She turned out to be a complete ninjabitch-- She fucked my best friend and didn't tell me for three months."
by Pebble January 17, 2006
(adjective/verb/noun/everything) like a muvvabitch, but with ninja like stealth qualities about them . or, just as a slang term for anything
1.'improvisin' like a ninjabitch',
2'i'm gunna ninjabitch you in the teeth'
2'i'm gunna ninjabitch you in the teeth'
by seonaid April 29, 2006