When a woman defecates in an another woman's chest while wearing a g-string or a thong. The feces that lands in the woman's chest usually splits in to two pieces.
When I was in Mexico, I witness this gorgeous woman give a Mexican Banana Split. It was amazing... There was stress show in the receiver's face.
A MexicanBurrito is when you are having anal sex and the chick shits on your dick, making your dick all shitty. You then give her a shit stache, literally.. you give her a mustache with the shit on your dick.