Derro - australian slang for derelict, namely teenage kids you dress like trailer trash, start smoking and drinking when they're 11 and learn their abuse of narcotics from their drug dealer/alcoholic/government support relying parents. Often live in government housing or low budget, dodgy rep suburbs.
International equivalents : Chav, 'gangsta', Adelay, Lad
*emo kid walks past*
Derro: Haii brahh, check out dat stupid fkn emo. Get im manh
Emo: Fuck off you derro loser. Go smoke some heroine
Derro: Yo brah what you say? Say dat to my face beetch. You wana start me ey?
Derron is a great friend to have. He is am athlete but still hangs with the unpopular kids. When your down he cheers you up. But he has angermanagment problems and gets mad easly. He is short but flirty and great at football.