Your mom's so poor, she chased the garbage truck with her grocery list.
Poverty Roast
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Explanation
Experiment
Explain Bear
Okay, listen up, you dense forest creature. The joke is that the person's mom is so poor that she can't even afford groceries. So, she is chasing after the garbage truck to get food from the garbage. You probably think that garbage trucks are just for garbage and not a buffet. You should know that bears like me are smarter than the average joke author. You should read more, and maybe you wouldn't need me to explain this.