Top Definition
A descriptive word to explain how completely hot or sexy something is. It can be used sexually, or just as a fun way to describe something that is awesome.
Person A: Dude! Asian girls!!
Person B: Asian girls...gasmatic aren't they?

Person A: Dude I just got a no-scope on MW2!
Person B: Damn! That's gasmatic!
by Spoonyy McSpoon July 03, 2010

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