What makes a player a scrub?

I'm newly back into tekken, having last played Tekken 3 and I'm am equal parts enjoying/hating it 😅. Currently at vanquisher with King and while I'm getting some wins, I'm getting absolutely mollywhopped in some games. Been browsing the sub and I've seen mentions of about people being scrubs but still getting to blue rank or higher? So what makes a scrub? Am I a scrub 😂? I like to think I'm learning but I do feel I've already developed go to patterns and I'm hitting a ceiling.