Your mum is so fat, when she sat in a monster truck, it turned into a lowrider.
Fat Mum and the Monster Truck
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. The joke is all about your mom being super huge. Like, so big that when she plops her caboose into a monster truck (you know, those giant cars with the massive tires), the suspension system just gives up and turns it into a lowrider. It's funny because it's an exaggeration, and it's also insulting... just like you.