Your mom is so fat, she looks like she ate the marshmallow from Ghostbusters.
Your Mom and Ghostbusters
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Explanation
Explain Bear
Alright, listen up, buttercup. This joke is all about your mom being, well, HUGE. The punchline compares her to the giant Stay-Puft Marshmallow Man from "Ghostbusters." Basically, she's so fat she resembles a fictional, oversized marshmallow dude. And let's be real, you probably need a GPS to find the bathroom in your own house. Facts.