Exageration of the word maximum, usualy used while wanting to create exageration but mostly used by noobs wanting attention.
This is the maxxx you can get.
by Urban noob March 17, 2008
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A behemoth back-firing fecal rocket.
You, sir, are a Maxxx.
by =) February 03, 2005
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driving your car 170+ mph and just when you thought that its at its max,you release nitrous oxide.

"the car gave its maxxx"
by marcusious June 02, 2006
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