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1) It is literally off the mainstream, it is the hipster's way of saying the word hipster/indie.

2) A term for a small stream that joins to the mainstream.
1) Found this new band on youtube with only 12 views on one of their songs, i'm so tributary.
2) That was a tributary stream, joing on to the river Thames
by Say Watt? April 19, 2012
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Jul 13 Word of the Day
a phrase chiefly used in northern England.

it is a contracted form of "it'll be reet", where "reet" means "alright" or "OK".

living your life according to "be reet" is the only way to find happiness in life.
Geoff: "ZOMFG a just hopped off the buz n me 'ouse is burnin' down n me Deirdre's in there dyin!"
Jack: "Be reet."
by Tommmmmmmmmmmmm May 06, 2007
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