Usually under-aged teenagers who steal drinks from drunks at a party
Meet Carl, the most successful Drink Ninja; already on number 207
by Carl Flatbawls May 21, 2008
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1. To steal a sip of someone’s beverage.

2. At it’s most spectacular it is done with a straw, while the person is still holding their beverage.
There are lots of examples. If you go to facebook dot com slash ninjadrinking you will see a whole page dedicated to ninja drinking

Daniel Day Lewis showcased his ninja drinking skills in There Will Be Blood. Google "I drink your milkshake" and you will see the video on youtube
by drink ninja October 10, 2011
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An energy drink that is drunk by a VERY tired person in dire need of it.
Dani:Bro! I totally love this ninja drink!

Kailin: ninja drink? o.O

Ariel: LOL!

Dani: Yes. All the time
by Dani Maderos November 7, 2008
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