El Barto is Bart Simpson's graffiti-tagging alter-ego, and is one of the most infamous outlaws in Springfield.
El Barto's signature can be seen in a number of different places around town, especially on state buildings. To this day, El Barto's true identity remains a mystery to the vast majority of the people of Springfield.
However, Bart told Principal Skinner that he was El Barto when he and Skinner fell into a vat of Peanut Shrimp. Homer also seems to know who El Barto is, as he said "If Bart can be El Barto..."
How Homer found out isn't known, but it's possible that Bart told him as well. However, Homer did once say that he suspected that Milhouse was El Barto, even though at the time he was looking at a graffiti tag that showed Bart as Zorro.
El Barto's notoriety extends even to Springfield Elementary School. Seymour Skinner once said that "Bart is the second most wanted student after the mysterious El Barto."
 Variations / Uses by other characters
Homer once tried to adopt "El Homo" as his graffiti tag alias, similar to "El Barto". However, he quickly gave up on the idea because his alias was misinterpreted by a Gay Latino man as a declaration that Homer was homosexual, rather than Homer's intended meaning of it being a Mexicanized version of his name.
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When Maggie and Bart clashed over what to watch on TV, Maggie spray-painted the "El Barto" tag on the wall to get Bart in trouble so she could watch what she wanted.
The cover artwork of the comic story collection Bart Simpson: Big Shot! prominently features a large statue of Bart with the words "Eat My Shorts!" chisled into the pedestal. On the rear cover, the statue's pedestal has been spray-painted with the graffito "Bart is a wiener!" and signed with the tag "El Principalo". A spray paint can is on the ground near the base of the statue, and Principal Skinner is running away from the scene.
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 See also
||Wikisimpsons has a collection of images related to El Barto.