A phrase used in response to somebody doing or saying something so unattractive, that the most mighty of erections would quickly shrivel to the size of an acorn. Very much like the head of a tortoise would retract within its shell.
"Dude, did you see Lucy eating that sausage and egg mcmuffin earlier?"
"Yeah man, she got mustard up her nose and proceeded to spoon it out and eat it, total retracting tortoise."
When your butt/balls get burned, your penis will retract all the way into your throat, which will give you Retracting Genitaliation Syndrome. Also known as RGS.
James burned his butt on the metal ground, so now he has Retracting Genitaliation Syndrome.
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.