Someone who automatically tends to take the opposite point of view from the person to whom they're speaking, or to disagree with society at large out of a sort of knee-jerk reflex.
Friend: I've got some ice cream, you want vanilla or chocolate?
Contrarian: Um, do you have strawberry?
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Friend: I love indie rock, you heard of these guys?
Contrarian: Yeah, but they're not really that indie, though.
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Friend: I guess you're too contrary to vote Democrat or Republican, right? So, what, Libertarian? Green Party? ...Socialist Party?
Contrarian: Of course not, I don't think that any formal political party is a suitable representation of an individual's views.
Friend: *sigh*
