You could argue that fart jokes are juvenile (they are), but that doesn't stop them from being funny. There are so many packed into this little episode that it's hard to stop laughing if you have the mentality of a child.
The premise is fantastic - Robin tries to reign in the other Titans from employing progressively nastier farts on each other in an attempt to avoid the endgame Atomic Fart. Naturally, this happens when the dealer inhales their own brand, causing this re-ingested fart to collide with the next brewing bout of gas and cause a potent nuclear reaction.
Naturally, this atomic fart clings to the victim's head and turns them into a zombie and then continues to spread by butt to face contact.
Because of course it does.