"To shut the stable door after the horse has bolted", an idiom as old as horsemanship. Now it has a one shorthand, Hashtag friendly word to define the entire concept due to David Cameron and Razor the police horse in the scandal referred to as Horsegate. The origins on Gate as a suffix are in the Watergate trials of Richard Nixon
The most overused fucking kit on the Minecraft Hypixel Network. People overuse this kit to the point where it makes the game bad. Another word for horsetamer is cancer, actually scratch that, horsetamer is worse.
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.