A Southern California Punk Rock band, active from 1982 to mid-90s, and reformed a couple of years later. Formed by Adolescents/Social D's ex-drummer Casey Royer, being the only constant original member, other memebers included Rikk Agnew, Derek O'Brien, Dan Colburn among many more.
They relased seven studio albums, Team goon (1984, first relased as EP, later added tracks), Ancient Artifacts (1985), Horse Bites Dog Cries (1985), What good is grief to a god? (1988, tragedy Again (1989), State of Shock (1994), On the Western Front (2007).
There's a lot of bullshit around the "D.I." initials meaning, it actually doesn't means a fuck... just a dirty trick to keep fans idiotized.
No, DI, doesn't means "Drug Ideology"