This term is usually used when someone had just heard some good - often unexpected - news.
Dave: Guess what?
Mike: What?
Dave: When I went to get us tickets to the 'Stones gig, the girl at the ticket booth was an ex girlfriend of mine in college!
Mike: So? Big deal!
Dave: She gave us 'Platinum' grade seats and we only paid for 'Silver'! How do you like that!
Mike: That's excellent! My nipples are hard, dude!
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.