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1.
A ninja bitch is a woman who realizes a friend is attracted to her sexually and intentionally uses that attraction to manipulate him (term originated from the intellectual whores/ladder "theory" of male/female relationships).
She knows he fixed her computer because he's sweet on her. She wants "to be friends". What a ninja bitch!
by Alinama S. May 12, 2006
 
2.
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."
by Pebble January 17, 2006
 
3.
(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'
by seonaid April 29, 2006
 
4.
A female ninja
(Of course!)
*Reading book*
*Ninja Bitch steals money off dresser*
*Person stops reading book and looks at dresser and the money is gone*
Person: DAMN THOSE NINJA BITCHES! THEY DID IT AGAIN!
by Alex Bahder May 04, 2006
 
5.
Any attractive woman of asian decent
"BAM! Did you just see that tight ninja bitch?"

"yes; yes I most certainly did"
by SeptemberWasp May 27, 2005