A style of strumming the guitar to create a certain, unique sound. A Digga is a short, clean, stroke of a guitar/bass, often repeated quickly to add to the effect.
Usually played in Hardcore, Metalcore, and Post-Hardcore genres of music.
See: The Devil Wears Prada (Band)
Mike: Dude I love that song "Danger:Wildman"!
Kirk: Yeah I know, the diggas in that song are just incredible!