Where on the night of October 31st. every one comes to a party wearing there sexist costumes and then takes them off with the rest of there clothes and then fucks the reast of the night.
by Deep blue 2012 November 14, 2009
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A Mexican Halloween is a sexual act. It occurs when a man is having sex with a woman from behind and upon ejaculation, he opens up a can of chili con carne he had hidden earlier, and throws the contents of the can onto the woman's back.

Note: The chili con carne can sometimes be replaced with salsa sauce.
1: Why are you late?

2: I'm sorry, my boyfriend Mexican Halloweened me and I had to clean my back. Some even got on my bed.
by The Messy Mexican Avenger December 19, 2011
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It's never to early to plan for Halloween.
Jeff: Dude, look at all the candy I got! Male stripper =win!
John: Dude, that's awesome. I'm gonna be an Emo Kid next year.
Jeff: Halloween planning right after we JUST got candy?!
John: It's never to early to plan for Halloween.
by InfectedBoot July 30, 2009
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Another name for the (fairly uncomfortable) Bermuda Triangle sexual position, so called because the triangle between the woman's arms, her back, and the man's stomach resembles a chip.

A bunch of people saw Community and decided to invent Mexican Halloween online, not realizing that Mexican Halloween is not a sexual act, but a sexual position.
Mexican Halloween is a sexual position.
by British Swingmaster January 9, 2012
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A sexual position in which the man is taking the woman from behind, aka doggie style, while he is wearing a sombrero, she is wearing the Mexican flag tied around her neck and he’s holding like reigns, and he is screaming “¡Andalé!” and she is screaming “¡Bueño!”.
Him with his boys next day at school: “Damn, my back hurts so bad. I Mexican Halloweened my girlfriend real good last night.”

Them: “That makes me hungry for tacos!”
by Ellis Monroe March 23, 2019
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The act in which a girlfriend seduces her boyfriend for sex. However, once inside her, the boyfriend realizes that he has entered a dark and bloody mess. Often accompanied by a foul odor and a girlfriend shouting "Boo!" Most often occurring around Halloween.
Last night was Halloween and my girlfriend was on her period and I didnt know. To make a long story short, she gave me a Halloween Surprise. Needless to say, it was a mess! :(
by da hbomb October 27, 2011
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