Sorry, I mean it's not a thing. It's just a blanket statement people throw at others who confuse them in some way. Wearing a 'weird' wardrobe, listening to some 'odd' song? I don't get it, they must be a hipster.
It's not some definable trait or characteristic, it's just an annoying nothing word.
i always say this to people and by saying this it makes me a hipster, apparently