To describe something that no matter how much effort you put in to clean it... It will always be sh*t.
Boss: Deep clean the bleachers with soap and water.
Worker: Man, that's like 'polishing a turd'- regardless how clean we get them.. They will always get dirty.
Polish a turd- Alter something that can never be forgotten.
Despite your best efforts, there are some things you just can'tfix/improve.
To point out futile attempts to conceal/change the baisc nature of something.
1) Joe: Danny's back in town. He lost a bunch of weight, got a nose job, got hair plugs and now wears really flashy clothes but he's still one ugly motherfucker.
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.