Place it right after the blunder in your edit, then follow it with the Womp Womp Fail sound to close the gag, or cut to the SpongeBob Boowomp sound for a bigger finish.
Über diesen Sound
This short clip captures Super Kami Guru, the elderly Namekian elder, muttering 'Oh god damn it' in a slow, weary voice over under three seconds. It lands as pure comic exasperation, the sound of someone who has seen it all and is already tired of it happening again. It comes from Dragon Ball Z Abridged, the parody series by TeamFourStar.