The local druggie, zombie like in appearance but less intelligent. Addicted to the drug known Heroin or ''brown'', common in ex pit villages in the north of England.
Smackheads are generally scummy people who deserve no sympathy, will put the well being of their own children to get their fix. They will lie, cheat, steal use and abuse well meaning people such as family and friends to get there next fix.
Mick the smackhead was injectingheroin again while his kids starve because they have no food.