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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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