A Robtard is someone called Rob that does retarded things such as racing people across motorways!
Robtards are even more retarded than retards. They claim to only do stupid things because they look fun, "regardless of the stupidity or risk".
Robtards usually resemble giraffes. If a Robtard is found, please return it to Africa ASAP, preferably in a crate full of bird-eating spiders.
Warning - do not approach a Robtard. Failure to heed this warning may result in yourself ending up in a bush, pushed off a wall, poked to death, scared senseless, covered in hornets or just generally tortured. You have been warned.