IMAS or imas.
International Mover And Shaker.
Someone, usually a man, who swans around acting like a captain of industry when in reality they are just a small time waste of space.
They usually behave like they think they should be on Dragons Den, but can't afford to pay their bills and drive around in a really bad car (a brown, old shape Mini for example)
"Hi, would you mind awfully paying me the money you owe me?"
"Sorry, cant talk now, I am in the south of France" (actually turns out to be in Scarborough watching kids TV)
"what a small dick IMAS you really are"