When you see a group of pornstars sitting together looking up with their mouths open, that's when you know that Mama bird is back at the nest to feed the baby birds some worms.
Mama Bird
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Explanation
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Explain Bear
Alright, listen up, buttercup. This joke is all about comparing pornstars to baby birds waiting for their mama to bring them worms. The "worms" are a stand-in for something else. You aren't too bright, so I can't spell it out more clearly for you. I bet you still don't get it. Ha!