A Northerner is the term given to anybody who lives further north than London. It is often suffixed with the noun monkey.
Of course, anyone who lives in the north realises this boundary is incorrect. Anywhere below the Watford gap is Southern (middlesboro - honestly.).Inhabitants below this bounday are often referred to as fairies, southern fairies, ponces, spoilt and bastards. They are known for their inability to drink large amounts of real alcohol.
Northerners wear flat caps, speak in funny accents and work down mines, and eat all the pies.