I don't see why people these days choose their gender. There's only two, it's Nerf or nothing! (I'm just joking, I honestly don't care.)
Nerf or Gender Stereotypes
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Explain Bear
Listen here, numbskull. The joke plays on the phrase "Nerf or nothing," implying there are only two choices, kinda like how some folks think there are only two genders. The punchline is that they don't care. Get it? Probably not, you wouldn't understand quantum physics either.