I’m gay because I nutted on the wall, now there are walnuts.
Wall Nuts
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Explanation
Experiment
Explain Bear
Okay, so basically, this joke is playing on words. The dude "nutted" on the wall, which is slang for ejaculating. But then he says there are "walnuts," which sounds like "wall nuts." Get it? It's funny because it's unexpected and kinda gross. You probably didn't get it at first because you're not smart enough to understand wordplay.