Very derogatory term for an upper-class Brit, frequently one who gained his position via nepotism or other social connections, not through his own competence.
The trademark recessive chin is thought to be due to inbreeding.
The new guy? He's just a chinless wonder HQ sent down here to get him out of their hair for a while. I hear his father's on the board...
A person of high social class with no chin.
That billionaire is a CHINLESS WONDER.