Having sex as quietly as possible because there are people who could possibly hear you if you went at it the usual way.
My parents are staying in the guest bedroom next to ours so tonight we will have to have Ninja Booty.
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In RPGs and some MMORPgs, is another word for a character that can be in the forefront of the battle and survive the outcome due to sheer evasiveness rather than high armor and health. An example would be the assassin from the pseudo-MMORPG game "Guild Wars", especially in PvP mode.
"OMG, why duz teh PVP 'Sin not die? teh whole team is attacking him... I h8 ninja tanks
A Ninja-Lunch is when your co-workers start talking about where to go for lunch, and while you give some token input, like, "The pub" or "The donair place on the hill", you really have no intention of going to lunch with the boys. You've already secretly planned lunch with a redhead, and while the boys' backs are turned, you vanish like a ninja to meet your REAL lunch date.
Dave: Where should we go today?
George: The Old Admiral?
Brian: Yeah....uh....yeah...
Yoon: How about Burgers?
Joe: Alright guys, time to go!!
Mike: Wait, where'd Brian go?
Yoon: He must have gone on a ninja lunch again.
Noun: A morally bankrupt man who covertly removes his condom during sex in order to increase his pleasure at the expense of the woman whereby he ejaculates inside the woman without her permission and likely causing an unwanted pregnancy. The behavior of a condom ninja should be considered a type of sexual assault or sexual misconduct.
Verb: To act in the capacity of a condom ninja.
Noun: Poor Sharon hooked up with a guy who turned out to be a condom ninja and got pregnant.
Verb: What a jerk Paul talked about how we was going to condom ninja Lisa at the party tonight, we should warn her.
A Time Ninja is a person whos asks questions about a service and has no intentions of spending a dime with you on any of the services you just spent 30 min explaining.
Hello buddy how much is my air filter coolant flush and trans fluid exchange! Well sir it runs 300 dollars! Thank you buddy this is a great price! ok sir we can take care of this right away. Ok buddy go ahead and check them and ill come back another day! thank you for wasting my time ninja
A person who slips in a door quickly before it closes without touching the door.
That bastard door-ninja didn't hold the door for me.
When someone appears or disappears from the surrounding area with few or no people noticing.
Also when you do a really cool ninja move, especially if you could never do it again.
Joe: Oh, hi Jon.
Jon: Hi Joe.
Sam: Hey guys!
Joe: When did you get here?
Jon: He pulled a ninja.
Man: *drops glass*
Waiter: *catches glass without spilling drink*
Man: Wow, you just pulled a ninja!