A car rinse resulting from a rainfall.
This usually requires said car owner to be lazy, cheap, or both.
Guy 1: Man, It's raining again!
Guy 2: That's cool, always up for a Mexican CarWash!
It's gross, trust me you are better off not knowing what a Mexican carwash is.
I told a friend what a Mexican carwash is and he puked, cut off his toes and removed all the oatmeal and canned corn from his house.
The Holy Grail of sexual positions.
They say it has been around for thousands of years, but only a select few know how to do it exactly.
I came close to figuring out the mexican car wash yesterday.
They say the Mexican car wash is fatal 53% of the time..
The Act of tea bagging an individual after he/she has vomited upon your ball sack.
While going down on him the drunk chick threw up all over Richard's junk. As an act of retribution he gave her a Mexican Car Wash
When you have anal sex with a gay mexican, and pull out and make him suck your dick. Hence washing off your member.
Pedro really gave a great mexican carwash last night.
(v) Urinating on a willing girl after consuming vast quantities of Mexican beer. Can also mean to urinate in a gilr's ass and then having her shiss all over something or someone.
Hey, dude see that girl over there? I showed up at her place with a mini-keg of Dos Equis last Cinco De Mayo and gave her a Mexican carwash!