Guisao Share definition Flag (sometimes guisao) (Mexican expression). N. and Adj. A person with no class, education or style. Sometimes related to low status. Antonym: ebrits. How was the party dude? Well, at first I thought there were gonna be only ebrits but in the end it was crowded with guisaos.You're gonna come dressed like that? You're such a guisao. Guisao by h90_ November 11, 2011 Get the Guisao mug.