Place it at the end of a sleepy setup, after a plain fart sets up the gag, then follow it with a Vine Boom to underline the reaction shot. Keep the plain fart first so this boosted version lands as the escalation, not a repeat.
About this sound
This just-over-two-second clip holds a brief drowsy hush before one fart erupts, boosted until its low notes shake, buzz and drag out with a shaky tail. The leap from sleepy calm to crude noise feels childish, rude and instantly funny, a punchline with no setup that catches a room off guard.