by Blek02 June 17, 2022
A person sent in deliberately to have sex with someone's girlfriend with the intention of her significant other catching them in the act so he breaks up with her.
by TK37246 February 12, 2014
An assassin who uses stealth and guile to assassinate a penis, often causing death to the owner of that penis. Scissors, knives, razors, and fire are typical weapons of a penis ninja. An historical example of a penis ninja would be the woman who killed Genghis Khan by slicing off his royal penis. Lorena Bobbitt is a more modern penis ninja of note, although her intended target managed to survive and was reunited with it's body.
by Flavius Schmoesephus December 12, 2016
The act of using a long flourecent Light bulb as a Katana, and karate style hitting your friend making the bulb explode
by Geoff Robbins May 13, 2007
A beer you grab when you get home after being out with friends. You quickly take a sip to mask the the booze smell coming out of your pores. Your spouse assumes it's your first one since you just got home and isn't immediately pissed for you being shitfaced drunk.
When I get home the first thing I'm going to do is grab a Ninja Beer from the garage fridge, that way my wife won't know I've been at happy hour for the last 4 hours.
by elpac January 21, 2021
Drunk ass: Yo I thought this was regular piss beer, but this shit snuck up on me like a ninja. I was shit faced before i knew what happened.
Bro: yeah, who gave you that ninja beer?
Bro: yeah, who gave you that ninja beer?
by Vladivastok March 12, 2011
by Sir James Hat December 01, 2011