A G-string is a type of thong underwear or swimsuit, a narrow piece of cloth, leather, or plastic, that covers or holds the genitals, passes between the buttocks, and is attached to a band around the hips, worn as swimwear or underwear mostly by women, but also by men.
What does the G stand for G-string?
The name is short for “Groin” string. Yes, ew. It was invented as the absolute minimum fabric to cover your anus/groin and still be legal to work in a strip club (in cities that outlaw complete nudity).