As opposed to 'mainstream', means that something is so unique that it doesn't fit the common trends at that time; a very offstream person usually has no apple products in his household and doesn't belong to common social circles, even that of hipsters.
David: Hey Ty, have you heard of this new word 'offstream?'
Tyler: Yeah man, the word itself is so offstream that no one fucking uses it.

Lennie: Hey what are you wearing, man?
Derek: A purple shirt and shit. You wouldn't understand man, I'm offstream.
Lennie: Fuck you.
by AdHa August 10, 2014

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