Place it just after the visual gag or guilty look, then follow it with Awkward Crickets to stretch the uncomfortable moment before the scene moves on. For a louder group reaction, put Chipmunk Laugh straight after the crickets instead.
About this sound
This six-second clip is Fat Bastard saying 'Sorry, I farted' in a flat, shameless Scottish voice, with no embarrassment in the delivery. It feels crudely funny and deliberately awkward, turning a rude admission into a smug punchline that catches listeners off guard. The line comes from Mike Myers as Fat Bastard in Austin Powers: The Spy Who Shagged Me from 1999.