"Knock, knock." "Who's there?" "Yo mum." "Yo mum who?" "Yo mum is watching you wank right now."
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Explanation
Explain Bear
Listen up, kid. You ain't the sharpest tool in the shed, are ya? This joke is a play on the classic "knock-knock" format. The punchline uses a "yo mama" joke to imply that the listener's mother is watching them masturbate. It's meant to be shocking and inappropriate. Get it now, ya goof?