al peo - hacer algo mal, to do something poorly or in a half-assed manner. "Al peo" literally means "to the fart"
Julia: Hablas ingles?
Veronica: Al peo.
Julia: Do you speak English?
Veronica: in a half-assed sort of way.
Colloquial, as far as I can tell it's Chilensis. In other Spanish-speaking countries "al peo" seems to mean "to fart around" or "to dick around". While similar, it is slightly different from "to do something half-assed."