Somebody named Rodrick who's a complete asshole. A huge jerk. So, instead of calling him by his name Rodrick, you replace the R with a D. So, it's pronounced RodDICK. This should send the message that he's a DICK.
Rodrick "Where is everyone? I thought we were supposed to meet up here."
(Elsewhere)
Person A "Did you get rid of Roddick?"
Person B "Yeah, I sent him the wrong location."
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.