A slang term for Portsmouth & Southsea in the UK. The city of Portsmouth (and the smaller town of Southsea) are in fact on an island, called Portsea Island. The name has been made famous on a range of T-Shirts available in Southsea which have the words "Southsea Bronx - Strong Island" on them.
Out-of-towner: I need somewhere cool to hang out!
Strong Islander: Get down here to the Strong Island and chill!