From Longman Dictionary of Contemporary EnglishG-stringG-string /ˈdʒiː strɪŋ/ noun [countable] DCCa very small piece of underwear that covers only the sexual organs
Examples from the Corpus
G-string• I remember we had purple capes, little brown G-strings and crowns with feathers.• In rapid succession, he unzipped her moleskin trousers and drew the skimpy white lace G-string from her thighs.• The G-strings went back on permanently.• Thonged G-strings disappear up both cracks and there's never a good time to fish them out again.Origin G-string (1800-1900) Perhaps from G string “fourth string on a violin”, perhaps influenced by gee 