Someone who is clearly a retard and also is a homosexual.
Fred: I'm thinking of throwing a party this weekend
Carl: Nice...but dont invite andy he's a right reartard
Fred: A what?....
Carl: A REARTARD?
Fred: Dont you mean retard?
Carl: well you know andy he's dating edward and he's failed every exam he's ever taken
Fred: Yeah.....oh i get it REARTARD, thats quite clever