Bob decides to make a joke in a specific vein about a specific subject. But not just one joke, no no no, oh heavens no. He has to exhaust his entire supply of jokes and wise-guy commentary, getting them all out of his system.
The major difference between an Overly Long Gag and Joke Exhaustion is that the Overly Long Gag is one extended gag that goes on for far too long, while Joke Exhaustion [...] [tvtropes.org]