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 29, 2006
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The person(s) involve in the theft of beer from one party to take back to the party of their own. Once a beer ninja accepts the mission he must complete under any means neccessary. This includes but is not limited to 1)stealing from a friends party, 2)jumping fences, 3) wearing camoflage, 4)kidnapping people, 5) attacking from the sea, and 6)sending in spies to distract parties away from the mass of beer.
Chris: We are out of beer dude
Nick: No shit? Guy down the street is having a party.
Chris: Lets take his beer.
Nick: Its on. Beer Ninja style.
by thenick September 22, 2006
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On some college campuses with charitable upperclassmen, the beer ninja performs the opposite function, stealthily distributing Beer to those in need, rather than removing it.
Dude! The beer ninja was just here and gave us all beer!
by TiedownGiant August 15, 2009
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An educated epic beer guru with a no nonsense reportoire. One who guides, educates, inspires, with no bull crap. Genuine. Ninja
"Kara really knows so much about all types of beer and how they are made that she must be a ninja; a Beer Ninja!"
by Z Wine Ninja May 13, 2012
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When one drinks enough where they think they can kick everyone's ass.
Oh man! Bob thought he was a Beer Belt Ninja but the bouncer kicked his ass.
by Wkshpdad1 April 2, 2020
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a beer pong ninja is one who incorporates stealth and finesse into his or her beer pong game. these ninjas generally hide around doorways and large objects, as the trajectory angle from said furnishings significantly aids the beer pong ninja's shot. these ninjas are rarely seen standing in open space, and will remain hidden from sight until it is his or her turn to shoot, but will only appear for the few seconds it takes to shoot, as the ninja will return to hiding instantly. although he/she may look awkward or silly, it is unwise to underestimate the beer pong ninja, as his/her skills are worthy of singlehandedly destroying a whole team's livers.
man that beer pong ninja whipped my ass. i need to grow a second liver.

how the fuck does ryan shoot from the doorway??
he's a beer pong ninja..
by missambitions July 17, 2010
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A quick beer. Typically used around 5-6 PM amongst colleagues. People suggesting or agreeing to go for a ninja beer usually have the mutual understanding that one quick beer could lead to many.
John: "Hey guys, let's go for a ninja beer?"
Susan: "I actually have work to do when I get home. Well.. F*ck it; Let's go for a quick one"
by PinkBunny1990 March 12, 2016
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