When you are on your back and watching your phone and you lose your grip so the phone bonks you on the head.
I was lying in bed the other night when I was attacked by ninjas.
The act of silently masturbating while in the same bed as your significant other, likely while they are asleep.
My girl didn't want to give me head during her period week, so I had to pull off the ninja beat several times.
A roommate who steals your food in the fridge behind your back. They do it in a sneaky way by figuring out your schedule and stealing tiny portions when you’re at school/work.
“Dude I think Joe might be a ninja vulture.”
“Yeah that explains why my mashed taters keeps disappearing!”
A man so gay that he can run across a basketball court wearing clogs and not make a sound.
Clog Ninja
When you do something you know you're not supposed to do (whether it's good or not so good) or when you do something that other people (like your parents) don't want you to do.
Well...sneaking out to Caid's party at 11 p.m. was a real ninja mission.
A ninja who utalizes a sword in the art of combat.
Some Ninja: "what kind of ninja uses a sword... I'll tell you what kind of ninja a bitch ninja"
Samurai: "Actually I'm a samurai "
Some Ninja: "That's a funny way of saying bitch ninja"
an unexplained white stain on your clothing which obviously can not be explained.
What is that stain on your pants? Dang, I must have gotten ninja skee!