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Unlike other similar faces (like ^_^), this is supposed to look like eyebrows, with one raised.
Girl: Yeah, I would so do Amanda Palmer.
Girl's Boyfriend: -_^
by caitlin.the.revolutionary June 27, 2007
To show one's acknowledgement to something by raising an eyebrow. -_^ can be used in various contexts; it can mean one is excited, aroused, inquisitive, curious, or just stimulated in general.
~Someone in the neighborhood sparks a bowl~

The neighborhood: -_^
by anthoppapoppadopalis September 13, 2011