Meaning

noun leather strip that forms the flexible part of a whip

noun underpants resembling a G-string; worn by women especially under very tight pants

noun a thin strip of leather; often used to lash things together

originFrom Middle English thong, thwong, thwang, from Old English þwong, þwang (“thong, band, strap, cord, strip of leather; phylactery”), from Proto-West Germanic *þwangi, from Proto-Germanic *þwangiz, *þwanguz (“coercion, constraint, band, clamp, strap”), from Proto-Indo-European *twenk- (“to squeeze, press, pressure”). Cognate with Scots thwang, thwayng, thang (“thong”), Middle Low German dwenge…

Etymology from Wiktionary, CC BY-SA 3.0