The source for YouTube Shorts are from Zidane's hair.
Zidane's Hairline
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. This joke is saying that YouTube Shorts, which are short videos, get their content from Zidane's hair... because he's BALD! Get it? Hahaha! You probably don't even know who Zidane is. He's a famous soccer player, and you're probably just sitting there eating glue.