It is a extension of the word
thot she's a little thoty thooter me and my brother
add extension for word to mean every bad word you would call a hoe or whore prostitute slut bitch cunt all wrapped in one so by saying thooter we mean she is every bad name you can call a woman mixed into
thot-but added 3 letters there for being a extension to
thot but much worse than a woman who sleeps around that bitch is a snakey ass thooter we did a song called little thoty thooter