FTDT tattoo is not a well-known term or acronym. However, based on the search results, it seems that FTDT is an abbreviation for "From The Dining Table," which is a song by Harry Styles from his first solo album. It appears that some people have gotten tattoos inspired by this song, which has gained attention on social media platforms like TikTok. Additionally, the Twitter handle @gracesftdt seems to be a fan account dedicated to Harry Styles and his music.