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 rush of adrenaline in an unexpected moment
When you are dead asleep and something wakes you up, you jump out of bed due to a ninja rush
When you are mid-coitus and your roommate enters your dorm room. You proceed to jump off your bunk and into a snuggie (preferably mid-air) to tell them to come back later and/or warn them of the horrors going on in the room.
I had to come back to the party because Jennifer snuggie ninjaed me when i got back home. She literally jumped off the bed, tore her snuggie from a hook and jumped right into it before i got 2 steps inside.