Put it at the end of a silly skit as the final reply, after the setup has built up. Follow it with the Classic Fart Sound for a toilet-humour finish, or lead into it with the Vine Boom Sound for a bigger reaction.
Über diesen Sound
A very short voice clip of Talking Ben saying poopy, lasting about a second and a half. The single blunt word lands as goofy, gross-out humour, the kind of childish punchline that makes a dull chat suddenly ridiculous. It works because Ben sounds completely serious while saying something so unserious.