As dectected in the fuel supply by W.C. Fields. The term "Ubangi" denotes a black person. Taken altogether, the somewhat-famous Fields quote simply indicates something out of place or awry, some evil intent. Fields wrote in the 20's and 30's, so those people in positions of social power then didn't necessarily consider this offensive.
"I detect a Ubangi in the fuel supply." -W.C. Fields
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
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.
I had a trucker's tan after driving for 10 straight hours on a sunny day.