Where normally you would just add a surname
"ow Taff jones, get over here"
The Taffster doesnt need it.
"Taff Jones, get the brews on" (Taff Jones will oblige)
"Taffster do you mind if we make you a brew?" (the Taffster will usually nod)
Note: the Current "Taffster" is in the RAF Fire Service.