You're so fat that when you got to McDonald's, they had to call Wendy's for backup.
McDonald's Backup
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Explanation
Experiment
Explain Bear
Listen up, butterball. This joke is about how HUGE you are. You're so enormous that when you waddle into McDonald's, they gotta call Wendy's for reinforcements, like they need a whole other fast-food joint just to handle your order. It's a fat joke, get it? Bet you order a triple cheeseburger every time, don't you?