hey thanks guys... here´s the updated list so far:
Albania: Metalist
Argentina: Metaleros
Austria: Metler, Metla
Belgium: hard-rockeurs, Metal Heads, Hardrockers, Metallers
Brazil: Metaleiros
Bulgaria: Metali, Metalisti
Canada: (Dirties,) Bangers, Metalleux /Metalleuse, Pwel, Pouèle...