A combination of the words "mexican" and "excellent", used to describe something that is so great that no other adjective that can get the point across.
"Have you been to Destructoid.com?"

"Hell yeah, that site is mexcellent."
by Coonskin August 05, 2008
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see minteresting, the lesser of the two ultimate contractions, meaning most excellent... spawned in my mind as a direct consequence of Bill and Ted's Journeys and Adventures, bogus and otherwise...
just a better manner of expressing ones joy.
Other person "yo man, i finally got paid, AND we are gettin laid tonight!"
Me "mexcellent dude..."
by KitSteel April 16, 2007
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