When having anal sex with a heavily tequila-intoxicated individual the penis is pulled out of the anus right before orgasm and shoved into the mouth causing the receiver to vomit creating the mixture of "chocolate," tequila, semen, and vomit.
After leaving the Cinco de Mayo celebration Brigham was saddened to learn that he missed watching Jeremy give Emily a Mexican Chocolate Mixer.
by MojoWojo December 12, 2011