ninety 

English word in use in Ireland with the meaning of

(1) Completely wonderful, great, fantastic, etc. or
(2) Lost the head.

(1) The craic was ninety at PJ's party last night! (See craic)
(2) When he realised he'd missed the 'plane he did ninety.

ninety by SWYman June 14, 2011

ninety 

Typically used in schools. When a teacher or supervisor's not around and the student aren't doing what they're supposed to (i.e. Using their device, fighting, etc), a student that first notices a teacher is coming to their classroom yells to the class, "NINETY!". Which is a code word meaning a teacher is coming. The students can then quickly get back to what they're supposed to do.

Jack: Yo, Ms. Kira's coming back!
Sally: NINETY! HOT NINETY
*class scrambles back to do their work*
Ms. Kira: I'm back! Everyone doing what they're supposed to?
Class: Yes Ms. Kira
Ms. Kira: Good job!

ninety by ShamaDama-Ding-Dong! May 17, 2018

Ninety-Ninety Rule 

A rule for tracking computer programming development time.

The full statement of the rule is, "The first 90% of the code accounts for the first 90% of the development time. The remaining 10% of the code accounts for the other 90% of the development time."

The rule simultaneously emphasizes two important points in software development. The first is that for almost any product, most of the development time will be used on relatively small but difficult sections of the code. The second is that the first point often leads to extremely optimistic project schedules.

The ultimate lesson to learn from this rule is that the amount of the project that is completed is NOT tied to the amount of code completed, and that substituting one for the other can be disastrous.

The ninety-ninety rule is often mistaken for a typo, with users assuming that the first 90% of code should correspond to the first 10% of time; while this is logically correct, it is NOT the original aphorism.

A: "This stupid ten-line function is somehow crashing on one out of every 100 calls and nobody has a clue how to fix it. We've got a week left in the schedule and haven't even fully identified the problem."

B: "Ninety-Ninety Rule. You should have expected from the start that something like this would come up."

Ninety-Ninety Rule by DubbaEwwTeeEff November 3, 2009

Ninety-Niners 

Lab slang describing a group of quantum-computing researchers that has prepared a Bell-state using a two-qubit entangling gate with a fidelity equal or higher than 99 %.

German lab rat: The Raman laser is not locking again.
Indian lab rat: Hold my beer, I’m tweaking the PID parameters.
Spanish lab rat: Come on guys, without sideband-cooling we’re not Ninety-Niners anymore!

Ninety-Niners by Hyonoko September 28, 2021

Ninety-sixer

A sexual position where a man and a woman lie back to back, with their heads at opposite ends of the bed. With none of their sexual organs are even remotely lined up.

It is favoured by people with strong religious beliefs.

Yo man last week at bible camp I had a hot Ninety-sixer with Rach. Had to go to confession afterwards, but Geez it was worth it.

I hope Jesus wasn't watching.

Ninety-sixer by GreeneryTheSecond August 9, 2010

Ninety-percent water, ten-percent vinegar 

n.) a douche

adj.) the condition of being a douche.

Karl is ninety-percent water, ten-percent vinegar. As a matter of fact, he is the biggest douche I know.

Ninety-percent water, ten-percent vinegar by Blenderhead91 March 31, 2009

Ninety-Niner

A person who moved out to San Francisco during the Internet gold rush at the turn of the 21st century, roughly in the year 1999.

It is a play on the term "Forty-Niners," which refers to people who moved out to San Francisco during the gold rush around the year 1849.

Yes, I did come to San Francisco in August of 1999 to work for pets.com, but I find the term "ninety-niner" offensive.

Ninety-Niner by NYCDavid July 23, 2012