A word that appears only once in a text corpus or body of writing—be this a particular author's oeuvre, a work of substantial length, or a language's entire collection of writing, including the Twittersphere.
1. A person who coins new words or terms (such as "hapax legomenonist"). From "hapax legomenon," a longstanding linguistics concept referring to a term of which only one instance of use is recorded (based upon the Greek roots "hapax," for "once," and "legomenon," for "to say"). 2. (rare) A person who creates an entirely new Lego character out of various Lego pieces from different sets.
Scott: Wow, that Urban Dictionary is like a Star Trek convention for hapax legomenonists.
EJ: You took the words right out of my mouth.
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.