Ad trollinem can occur IRL, and can even be used by those unfamiliar with the act of "trolling". In these cases, the party claims that they were kidding or weren't serious about their argument in the first place, in an attempt to disassociate their selves with it.
Party B: The sky is blue because the ocean is blue and what you're looking at is a reflection of the ocean.
Party C: Actually, the molecules of gases in the atmosphere scatter light of short wavelengths, so the white light that enters the atmosphere is perceived as blue light from the ground.
Party B: Relax dude, I was just trolling.
Party C: Bullshit. I'm calling Ad Trollinem on that.