This relates to the world famous England Footballer, David Beckham. He was first nicknamed 'The Thong' by a Breakfast TV presenter on 'The Big Breakfast'.
Presenter: "And here is a picture of David Beckham,...
or The Thong, as we like to call him, on account of he looks like the kind of person who wears them"
Used by Eegra in their valentines day comic, where Bowser handed Peach a card with this phrase, and subsequently believes it is a sweet love message. Or something. Whatever the case, it's an exclamation yelled at a loved one that expresses ones awkwardness in a social or romantic situation.
"Happy valentines day! I will tear you a second cunt with my thorny cock!"
(Noun) Money made by strippers, esp. cash stuffed in their undergarments by strip-club patrons.
Copyright Jeph Jacques, QuestionableContent.net
"Lemme guess, you spent your thong-dollaz on lipo and a boob job? Of course, in your line of work those are tax-deductable"
Faye, Questionable Content strip #757
1. A male that wears a thong. 2 A woman with a hairy ass crack wearing a thong. 3. Someone with no ass at all where-in the thong can not stay in place.
That was such a Thong-Wrong. You need an ass to wear a thong.