A term used to describe a specific uncomfortable situation involving consumption of large quantities of Mexican Cuisine. After consuming lots of Mexican food (i.e. spicy bean Burritos) the subject proceeds to defecate themselves while riding a slip n’ slide. Can also be used to describe anal sex with a person who has diarrhea.
“I just ate a ton of Taco Bell let’s get the slip ‘n slide and go for a Mexican Sleighride!”
“Oh man look at the bathroom floor, it looks like someone went for a Mexican Sleighride in here!”
Bob: Hey Jim, smell my finger.
Jim: Nasty! It smells like asshole!
Bob: Yea, I just went for a Mexican Sleighride on Emily. She loaded up enchiladas and laxative!