Go to the replies, look at the top and it will say "in your mum."
In Your Mum
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Explanation
Explain Bear
Alright listen up, numbskull. The joke is that if you look at the top of the replies, it will say, "in your mum". It's a play on words, see? Your mum is a common target for insults. It's funny because your brain is the size of a walnut.