When person A eats Taco Bell and person B anal fists them, grabbing some poop on the way out. Person B then throws the "Mexican Poop" in person A's face, mimicking a monkey. Both people then take a shot of Tequila.
Grabbing Taco Bell now, do you want to Mexican Monkey Fist tonight?

Sara gave Mike a Mexican Monkey Fist on vacation and he still hasn't recovered.
by AmmrJammr February 17, 2018
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When a person does a line of any snorted drug off of a monkey's ass then licks the anis of the monkey
Dude I did a Mexican speed monkey last night
by MetalMan95100 March 18, 2010
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