The opposite of Beauty bias, where the attractiveness of a person makes you more suspicious about their true character, usually causing you to act more closed off or cold around that person than usual because of their beauty, thus the sus.
Friend: “Do you have something against them? Is there some kind of beef going on that I don’t know about?”
You: “Nothing really, I just don’t trust them. Beauty sus I guess, they’re just too hot to not be some kind of freak if you ask me.”