An unnecessary addition to something that was previously working without it--like putting a hat on top of another hat. In comedy, this is used when placing two funny things too close to each other so that they distract from each other.
Bob told a joke on top of another joke. I warned him he was putting a hat on a hat.
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Trying too hard to make something obvious, typically comedic.
1: Sigma
2: What's sigma?
3: Sigma balls! Get it? Because sigma kind of sounds like "suck my"!
4: Yeah dude I got it, you're kind of putting a hat on a hat here.
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