When someone is talking bullshit, another people listening may interrupt saying, "Can you smell that?", referring to the imaginary smell of bullshit coming from the original speaker.
Person 1: I pulled this stunning girl at the weekend
Person 2: Can you smell that?
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Famous catchprase of Dwayne "The Rock" Johnson.
Rock: Hey Cena?
Cena: What?
Rock: Can you smell what The Rock is cooking?
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