A lumpy butt caused from bathroom cleaning chemicals. Specifically happens to Mexicans because their butt DNA mutates and causes lumpy butt.
Example for "Sad Mexican Butt":
Kyle: "Yo what happened to that girls butt?
Matt: "Dude you know she cleans bathrooms at night, she has that sad Mexican butt from the chemicals."
Kyle: "Yo what happened to that girls butt?
Matt: "Dude you know she cleans bathrooms at night, she has that sad Mexican butt from the chemicals."
by MGM8000 December 23, 2013
Get the sad mexican butt mug.