Have you heard of the Xbox game Sea of Thieves?
See if these nuts fit in your mouth.
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Explanation
Explain Bear
Listen up, buttercup. The joke is using the phrase "see if these nuts fit in your mouth" as a dumb, vulgar gotcha. "Nut" is being used as slang for testicles, so the joke is really about the author asking if you can fit his balls in your mouth. You're the kind of person who still uses Internet Explorer, aren't you?