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A time in the 1900s the 1990s was a fun jazzy time but was less 70s and more 21st century.
Guy 1:What is that guy wearing
Guy 2:Its so nineties
by matt tomson March 20, 2014
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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.
by SWYman June 14, 2011
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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!
by ShamaDama-Ding-Dong! May 17, 2018
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