can you smell that?
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?
Person 2: Can you smell that?
Can you smell what The Rock is cooking?
Famous catchprase of Dwayne "The Rock" Johnson.
Rock: Hey Cena?
Cena: What?
Rock: Can you smell what The Rock is cooking?
Cena: What?
Rock: Can you smell what The Rock is cooking?