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1.
The act of pouring a mixture of salsa, sour cream, tomatoes, chili powder, and corn in a prolapsed anus. And then eating said "soup" out of said anus with a other mans penis.
Tom: "hey John, you wanna give Amy a Mexican surprise?"

John: "fuck yeah!"
by P.P Rubbins January 21, 2014
 
2.
When a girl goes down on a guy and puts a finger up his ass without him expecting it.

The Mexican Surprise was popularized by the award winning film "Y Tu Mama Tambien".
Yah, she's awesome, except she gave me a Mexican Surprise last night.
by dj tightFold September 15, 2010
 
3.
When you're dating a smoking hot 22-yr old Mexican girl, then marry her, and she wakes up the morning of her 24th birthday having suddenly gained 100 lbs and looks exactly like her mother.

Surprise!!!
Be careful man, you don't want to wake up one day to the Mexican Surprise.
by levarselosmonos April 07, 2011
 
4.
A Mexican popping out of your closet during the night and raping you.
Kids from jessica's school

Tom: "Did you hear Jessica hasn't been coming to school because Tomas pulled a mexican surprise on her?"

Tami: "OMG, that is terrible, has Jessica contacted authorities?"
by sexfiend37 June 21, 2011