Place this clip as the final spoken beat after the setup, then follow it with a bruh reaction for the group's disbelief. If the scene needs a cruder payoff, swap that second hit for a fart with reverb and end the edit there without adding another quote on top.
About this sound
This is a 7-second voice clip of a deep, gravelly Batman-style voice delivering the line about something being in his ass, completely straight-faced. The humor comes from that serious superhero delivery colliding with such a crude, unexpected complaint, making it feel absurd, awkward and instantly quotable for anyone who hears the contrast.