Your mom is so fat nobody can compare her to anything.
Incomparably Fat Mom
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Explanation
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Explain Bear
Alright, listen up, buttercup. This joke is all about your mom being super, duper, mega fat! Like, so fat that you can't even find anything else to compare her to. It's like trying to compare a whale to... well, nothing, 'cause your mom is the biggest thing around! Don't feel too bad though, your IQ is still lower than her weight!