I want to catfish someone.
What do you mean by catfish?
I'm gonna pretend to be some hot girl to toy with some random dude online.
When someone is catfished, it can be extremely damaging to their mental health, especially if they are emotionally invested in a romantic relationship with you. It is ethically wrong and you should avoid doing it at all costs.
I like being a jerk though. So, this sounds like a good time to me.
Intentionally lying to someone to get them romantically invested in a fictional person is cruel and will cause them lots of pain. When you lead someone on like that, it will make them very upset and lose faith in dating other people. You should find a way to fill your time that doesn't hurt other people.