Youssir

n.

An informal way of addressing someone.

In use

Youssir, could ye give us 5 crusty blaas and a pound of red lead!

Let Lawrence Muck translate it to posh English for you
Lawrence Muck

Cheerio! Oh wait, that's goodbye. Hello! Would you like me to translate 'Youssir' in use for you?

Good sir, might you give us five crusty blaas and a pound of luncheon sausage!