Ring-Dang-Doo is a nonsense slang word typically used to describe a women's genitals similar to "Pussy".
The word has no etymology and first appeared in a song by Sam the Sham and the Pharaohs but the word also made an appearance in the 2018 western action-adventure game Red Dead Redemption 2 in a campfire song.
Ring-Dang-Doo now what is that? It's soft and round like a pussycat, Got a hole in the middle and it's split in two; And that's what you call the Ring-Dang-Doo.
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.