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1.
A transitory state in which a swarthy Latin is changed from the state of being alive to the state of being dead. Usually perpetrated by a southern lynch mob.
"Caesar Chavez died due to a combination of advanced cystic fibrosis and mexecution." -School Textbooks
by AdmiralDavidov July 15, 2006
 
2.
When an illegal Mexican dies via electric fence when trying to cross the border.
I doubt you can jump high enough to avoid a mexecution.
by Hazim June 14, 2007