Your mum is so fat, I had to take 2 buses and a train to get to her good side.
So fat...
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Explain Bear
Hey, chucklehead! This "your mum" joke is saying the mama so obese it takes multiple forms of transport to reach her 'good side'. The joke implies she's wide as heck. Listen, if you don't get it, then you are as dumb as a bag of hammers.