Thag Share definition Flag A swear/slur for those who use the wrong variation of there/their/they're Person A: "Yea, they're grandma bought a ton snacks for the party." Person B: "It's 'their' you thag." Thag by softiexspence November 16, 2022 0 0 Get merch Get the Thag mug. Buy Now — $32.95 See more merch