A close friend who feels comfortable coming into your house via the side door, probably off the kitchen. You, too, are comfortable with this friend entering your house through the side door. A side-door friend is probably one of your best friends. Conversely, front-door friends are those acquaintances you are not all that close/comfortable with.
Marcia and me hang out constantly. She is totes a side-door friend.
(noun) Taking a poo on one side of the toilet seat, facing the wall. On a 90 degree angle from the regular pooping position (RPP). Usually in desperation, due to skid marks or pubes on either side of the toilet seat.
"I was forced to use the side door because there was shit stains on the front of the toilet seat."
- Joe-fizzle
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.