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1.
when someone becomes overwhelmingly excited about mexicans.
Hey Francine, did you know they opening up the borders?! I'm so mexcited!
by Bshea992 October 14, 2007
 
2.
mega + excited = mexcited

should be used if you're more than just excited.
"I'm mexcited to work with these guys"
"i am mexcited to meet you"
by alspike December 02, 2010
 
3.
An intense adrenalin rush similar to that of a mexican who has just successfully hopped the boarder
April: OMG I'm so mexcited for the Scrabble tournament I could shit myself!

Mackenzie: Ur disgusting
by daterapril July 18, 2008