1. Thank you. Backformed slang from adding vowels to the Internet abbreviation KTHX, or "ok, thanks."
Thus far, observed as spoken slang only, although given the ironic usage of "kthx" in the first place, it may not be long before someone sweeps it back up into their chatspeak as part of the Internet's continuing dumbassification.
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.