1. To do something rebelliously; often disobeying authority or some other source of external social pressure.
2. Common mis-spelling of definitely, often arrived at when a person types definatly or definately into a spell-checker, and the spell-ckecher changes it to "defiantly".
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.