The term 'Sinjoren' is sometimes used as the
collective noun for the inhabitants of the
Belgian city of
Antwerp. The word is derived from the
Spanish "
Senor" and is a link to that period of
Antwerp's history, (the 17
th century), when the city was ruled by
Spanish lords.
Strictly speaking, not every Antwerpian can call themselves a 'Sinjoor'. To qualify; you, your father and his father must all have been born in a certain medieval quarter of the city.
It's a bit like the Belgian version of 'cockney', I guess.