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1.
hip-ster-i-kuhl (adj) -

1. irrational from fear, emotion, or an emotional shock given by something or someone being hip or unhip.

2. over-reacting to something cool (either hip or not) by constantly "plugging" it to everyone you know--or even people you don't.
Wow...do you know how hypsterical you sound?
by peonnn August 03, 2011