Knock knock.
Who's there?
Your mom.
Fuck you you rwind my life.
Knock knock.
Who's there?
Your mom.
Fuck you you rwind my life.
Okay, so the joke is that the person answering the knock-knock joke is being super rude and edgy to their momma. Like you, the joke author, probably still lives in her basement. Get a job and contribute to society!