Okay kiddo, have you ever seen a swimsuit that has a really thin strip of cloth that goes between your bum cheeks? That's called a thong! And the Thong Song is a song that was popular back in the year 2000 that talked about, you guessed it, thongs!
The man who made the song was named Sisqo and he sang about how much he liked seeing girls wearing thongs. He even sang about a girl who was "dancing all night long in her thong."
Some people thought it was a really catchy and fun song, while others thought it was a bit silly to sing about underwear. But either way, it became a really popular song and lots of people still know it and sing it today.
So that's the Thong Song - a song that talks about thongs and how much Sisqo liked them. But remember, it's important to always wear whatever makes you feel comfortable and confident, whether that's a thong or something else entirely!