A spew or sound acting on a read.

[Hyperrrprank]

This is a super standard calldown.

Taking this line against a bluffy, tricky player in pots like this takes away their favorite toys, which has some metagame considerations if it frustrates and/or tilts them. It even helps if he actually has the hand, since he'll slowly stop trying to bluff you if he's observant enough to see your not scared of his extra bets and are going to call him.