Booby
A booby is a type of seabird with bright blue feet. They’re famously dumb and that’s why it became a nickname for stupid people in the nineteenth century. It’s also a reference to a part of the female body but we’re not sure which one is relevant here. Check out the receipt below because it’s confusing.

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Maybe this booby swapped its pescatarian diet for burgers. There’s nothing wrong with having a bit of variety. However, it’s more likely that somebody thought that they were being funny when they left one of the most immature notes ever. At least try to have a little bit more originality because this is weak (via National Geographic).