Top Definition
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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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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