To give less then your full effort on a project or task. To exert less than 100%.

To work in a half-assed manner.
Sam really ninety-sixed that presentation to the client!
by illShatner December 20, 2013
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1. Slang term for the hair style commonly reffered to as a "mullet," "Kentucky Cascade," or "Camero cut." The term is derived from the ratio of hair in the back (90%) compared to the front (10%).

2. A favorable smell ratio between vagina and asshole experienced during a 69.
1. The male of the species will often fluff his 90-10 before entering a Denny's. The goal is to attract a suitable mate.

2. She was a very nice girl but she wasn't quite a 90-10. More like a 60-40.
by JeronimusPrime January 10, 2005
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the most extreme, ultimate lipper and dipper possible; instructions: take a fat ass dipper and stick into your upper lipper.
Lippers and Dippers, and Slippers and Flippers......Upper Ninety
by phisharmy December 3, 2003
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Definition:
94nication is the term Pink has used to describe the issue of trans girls automatically believing they're entitled to a physical relationship, particularly with other girls. The problem was initially rare, but occurred enough to receive its own namesake.

Origin:
The origins are unclear, but one was said to draw a certain distinction between regular women and trans women, denoted by the phrase, "A '4' is not the same as a '9'," -- you know, because sometimes a '4' can resemble a '9', but obviously a '4' is not a '9' from a factual standpoint, even if their differences contribute to their beauty.

Just put the numbers together, '9' and '4' to get '94'. Then be disgusted by the attitude some scrub could acquire if they became a trans woman, hence ninety-fournication.

Alternative:
If it isn't a trans woman in question, but a fem-boy that is putting forth a sense of wrongful entitlement, some have posited the use of the term 84nication. However, 84nication could also refer to guys with man-ginas who believe the fact that they have a vagina automatically entitles them to get physical with women.
Gamer: Good day.
Bloke: Hi.
Gamer: So how's your team in Pokemon Moon?
Bloke: Omg same. hey do u like 2 write yaoi 2??
Gamer: Not really but I--
Bloke: *porn anime spam* LET'S GO!
Woman: Oh, no. Looks we got a case of ninety-fournication.
Bloke: Wtf omg you lot are transphobic insensitive TROLLS@! MODS! MODS!
by NotMe11443611242639 December 19, 2019
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A Man who Engages in Sexual Intercourse With Other Men
Usually This Term Refers To All Nazis.
Hey Look at Those two Guys kissing,they must be Ninety-Niners
by Corey Bloom October 23, 2006
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A term declaring the nineties to be the first decade in which men could show their sensitive side and become sensitive new age guys. Referring to someone as a nineties man suggests that they are the type of guy who is not afraid to order quiche in a restaurant or cry at a movie. This evolved into the term metrosexual, a man with an excessive grooming routine, or who manscapes.
"Hey, I'm a nineties man." or "Remember when everyone used to say 'Hey, I'm a nineties man?'"
by jessperado March 7, 2013
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hahahah HEY rob upper ninty
Rob did u catch that fatty uppre ninety
by Nick Birky December 4, 2003
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