Your mum's hairline was so big that Dora the Explorer could not find it.
Dora Can't Find It
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Explanation
Explain Bear
Alright, listen up, buttercup. This joke is saying yo mama's forehead is so massive, even Dora, who finds everything, can't locate her hairline! Basically, she's got a fivehead, not a forehead. And you, well, you're probably still using training wheels on your brain.