Place it at the very end of a short reaction edit, after the accident is revealed on screen. Follow it immediately with a Funny Ha Ha Laugh Sound Button to let the group react, or a Ba Dum Tss Drum Sting Sound Button for a more staged punchline finish.
About this sound
This is an ultra-short voice clip of the German line Ich kacke in die Hose, delivered as a blunt confession about pooping your pants. The feeling is instant embarrassed panic mixed with gross-out humor, because the statement lands as a shameful accident announced out loud with no warning, setup, or attempt to hide it.