If all the class are straight but you think that someone is hiding that he's gay, you're an investiGAYtor.
InvestiGAYtor
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Explanation
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Explain Bear
Okay, listen up, you smooth-brained mammal. This joke is playing on words. "Investigator" sounds like "investiGAYtor". Get it? Because the dude is gay. You are not very smart, are you?