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When something is incredibly sweet or "hip." When someone incredibly white tries to express the fact that they are doing something cool.
Astrojax are very hippin. or
Adam:Hey Mike, what are you doing?
Mike:Playing with Astrojax.Am I hippin or what?
Adam:No Mike, your not hippin.
by Adam Randall April 09, 2006
Cool,sweet, like good, up to date( must be said in american accent)
WOW! Your phone is so hippin girl
by dictionary_x October 18, 2010