Thongs are triangular pants with a string that lies between buttocks and connects to waistband. Read about what is thong, benefits, and more. The meaning of THONG is a strip especially of leather or hide. thong (plural thongs) In Australia, "thongs" tends to refer to footwear. In the United Kingdom and the United States, "thongs" tends to refer to undergarments. A narrow strip of material, typically leather, used to fasten, bind, or secure objects. Learn the English definition and meaning of Thong with examples, pronunciation, and translations to enhance your vocabulary.