Place it at the peak of a fail, after Cartoon Slip sets up the mishap and before Nelson Ha Ha answers the embarrassment, so the sequence builds from a slip to the announcement and then to mocking laughter.
About this sound
This is a brief animated Batman voice clip, about eight seconds long, in which a cartoon character panics and announces that something is stuck in his ass. The blunt, startled delivery feels surprising and awkward, turning an ordinary reaction into an absurd joke. It comes from an animated Batman clip that spread as a crude shock-reaction sound in memes and fail edits.