Someone who is very sneaky, like a ninja, yet smooth, like a fish swimming

An actual fish wearing ninja clothes, usually a goldfish.
"Oh man, you snuck up on me, like a ninja fish!"

"Tony:Why did you dress up you goldfish in ninja clothes-its gonna die.
Danny: Yea but i own a ninja fish"
by Danny915 September 26, 2008
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A person who looks and behaves like a completely normal person and is typically not physically imposing, that actually has profound skill in the martial arts without anyone knowing of it.
So I was walking home sort of late last night with Dan when four guys jumped us! While I was cowering on the ground I heard Dan make some Asian noises and a bunch of thuds in quick succession. Then there was silence for a few seconds followed by the sound four bodies hitting the ground. It turns out my brother Dan is a closet ninja.
by AmericanSwagSociety December 26, 2010
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The Ninja rap pwns the crap of most Eminem songs!

Ninja, Ninja, RAP! Ninja, Ninja, RAP! Ninja, Ninja, RAP!
GO GO GO GO
Go Ninja, Go Ninja, GO; Go Ninja, Go Ninja, GO!
Go Ninja, Go Ninja, GO; Go Ninja, Go Ninja, GO!
GO GO GO GO
by Ninja January 27, 2005
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A black person who's trained in the ways of the ninja. Ninja Nigs typically possess exceptional night time stealth ability, as long as they don't smile.
Chris: "Do you think Wesley Snipes can ninja nig his way out of prison?"
Sean: "Shit no, nigga."
by dirtyjeff June 10, 2008
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one who stealthily can steal another's beer. basically a beer ninja is one stealthy m0-fo and can do it right in front of yo face.
Yo digga, tonite i stole a beer and used kim's fat ass as a screen when i leaned over and grabbed it off the fuckin coffee table. I'm a hella sweet beer ninja.

Hahahahaha Dave was so drunk i walked right up to him and stole his beer like 2 feet from his face. fuckin hilarious. Man that makes 2 beers tonite. I'm such a fuckin beer ninja, yo.
by jassu19 August 28, 2006
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someone who manages to enter and exit intimate situations with ninja-like stealth. also used to describe someone highly skilled in the art of sex.
-"at the beginning of the night i had no intention of bringing him home, but before i knew it we were in my bed."
-"my goodness! well, was he good?"
-"amazing. but after we were done i closed my eyes for a sec, and just like that he vanished without a trace."
-"ahh, a sexual ninja."
by woundedgazelle December 12, 2005
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After a sporting event; when your teammate is washing his hair and his eyes are closed, someone sneaks up behind him and checks his oil with their thumb (quickly slips a thumb in his ass), then runs off before he is able to rinse the soap away and identify the clandestine violator
After the game someone gave John a rusty ninja. John was attacked by a rusty ninja after the game. Be careful, there's a rusty ninja in there.
by sandy_x November 27, 2012
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