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1.
To penetrate another person without that person having knowledge or noticing.
Person 1: Whoa what was that?
Person 2: You just got ninja fucked!
dodane przez mario420 wrzesień 06, 2006
 
2.
To have sex in a quick and intense manner.
"I could tell by the look on her face that she got ninja-fucked last night."
dodane przez Jordy-Time luty 16, 2006
 
3.
To have sex in a bunk bed without your bunkmate noticing.
Dude, I ninjafucked this girl last night. My roomie had no idea. I guess he likes being rocked to sleep.
dodane przez mizzou22 listopad 20, 2008
 
4.
If I heard this right, it refers to the action of being sexed half-willing, whether out of obligation or whatever motivation (this isn't referring to rape, mind you). It comes from a movie called Dog Park, and I'd like to see the term used more.
"How'd it go last night? Well, she ninjafucked me."
dodane przez geoffy mcgee sierpień 05, 2004
 
5.
When you ( a male) is having sex with two other people ( male or female) and you fuck them in the butts back to back. Hence, you see an ASS, you see an ASS, and you went IN, or assassin ( which is a word used to describe a ninja).
Joe Schmoe: Hey bro, I just had a consecutive buttsex with these two smoking hot chicks last night
Douchebag Dan: Duuuuuude! You just had a Ninja Fuck!!!
Joe: Totally gnarly dude!!
dodane przez Jdawg96 grudzień 17, 2013
 
6.
wearing a black-body suit with only your dick n balls hanging out in a very dark room, drunk ho walks in u tap that shit with your baby dick, and peace out with her having no idea...ninjafucked.
God damn im so fucked up in ninjafucked.
dodane przez DirtyLightaOriginator czerwiec 11, 2010