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A combination of enthusiastic and spastic. Used to describe an individual who gets way, way too excited about something.

The cartoon character Sponge Bob Square Pants would accurately be described as enthusiaspastic. Some sports fans can get a little enthusiaspastic.
Joe: wooo!! wooo! YEAAAHHH!!! OH MY GOD!! OH MY GOD!! WOOOO!

Jillian: "umm..wow. Enthusiaspastic."
by Kitty Westminster September 12, 2010
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