When you are among a large group of people (Usually people you don't know, like at school or a train station or a store) and suddenly the air becomes occupied by a nasty odour.
The act of "smell discrimination" comes into play when you decide by the people who surround you and their physical appearance/demeanour, who it is that created the disgusting smell.
(In a store)
Guy 1: "Dude, something smells like rotten eggs. I think it was that fat hairy guy over there" *Points*
Guy 2: "That's smell discrimination! It could have just as easily been that hot girl in the pink tank top!"
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the USCoast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
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.