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.
When an individual succombs to the pressure of fear, anger, and/or insanity and begins taking out people or groups of people with cunning tactical ninja like efficiency.
Margaret went on a ninja rampage after missing a deadline at work as she stealthfully cut off every driver within a 2 mile radius down i-5 before catching up to her boss and ran him into the ditch.
The act of receiving discreet pleasure in from a partners hand under a blanket, coat or table.
Dude, we were watching movies at Stacy’s place last night and she totally gave me a ninja handy with her sister in the room.
its like aggressive (in the passive aggressive sense) but you dont know theyre being aggressive. ....sneaky aggressive.
not to be confused with passive aggressive
Like some farts (silent but deadly)
Im aggressive, but you dont know its happening. Im like ninja aggressive.