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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
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Aug 11 Word of the Day
A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.
"My boyfriend has a total case of brain worms. He told me the cat was bugged so the Feds could listen in on us having sex..."

or

"You totally stumbled over that entire sentence. Can't speak English all of a sudden? What, do you have brain worms?"
by _Jez_ October 03, 2009
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2
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
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3
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
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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
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