To fornicate a person, or being, without them knowing or noticing; Also slang for succesfully using the "date rape drug"
Example 1
Ninja Fucker: "That blind girl had a nice rack last night huh"
Random guy: "Word."
Ninja Fucker: "I ninja fucked the shit out of here"
Example 2
Girl 1: "Don't go to any parties at Will's house'
Girl 2: "Why not?"
Girl 1: "I heard Amanda got straight ninja fucked over there"
Example 3
Smoov-e: "I'm a Ninja Fucking master"
2π 2π
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!!
3π 7π
boy who has a large pimple on his ear that is like the rainbow, and has 2 small polka dots on the inside on them. this pimple dangles down to his balls. they make his balls smell like dirty spider webs. that are like the rainbow :) and when you run into a wall you turn into a ninja but can change to the colors of its soroundings and when you hit some one they turn pink and puff away into a booby. and if some one happens to take you to the hospital just say, a panda bit my nose off. and then give them the evil hamster in your pocket and say its a gift from budah, and then on your way home be sure to ride your elephant to Target for a box of tampons so you can give his boyfriend a dirty qujuan and then run off to your mexican lover in japan.to save him frooooooom godzilla!!!!!!!!!!
boy: man my pimple just grows by the minute!
girl: omg! was that a panda that just bit your nose!?
boy: ahhh take me to the hospital!
girl: did you give the nice man your evil hamster you got from budha?
boy: ya but i cant find my elephant......
girl: well you bes get yer lazy ass up an find it cuz i got a suprise for you.
...LATER...
boy: okay i found it.
....WHAM!.....
boy: eww what the fuck wass that?!
girl: thatd be a dirty qujuan well i gotta go and save my mexican lover in japan from godzilla now
..ring..ring..
boys lover: godzilla no!!!!!
godzilla:grrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
girl and mexican lover: nooo dont eat us!!!!!
boy: hahaha damn that sucks.
BAM a ninja fucking unicorn was born
4π 11π
Like a fucking ninja is when you escape from a place or thing or situation or person without being detected.
"And while she turned around to see where the noise came from, I jumped up and escaped through the vents. Like a fucking ninja
I ninja fucked that bitch last night thanks to some pills I slipped in her drink.
To be completely silent during any type of intercourse
(Friend A) "did you have fun with John Smith last night?"
(Friend B) "It was alright, but he Ninja-fucked me and im not into that. It was so quiet you could hear crickets!"