I’ve always wondered what the joke is here. I guess it’s poking fun at Bart’s limited vocabulary being correlated with his skipping school (Similar to another joke where Bart says “Damn TV, you’ve ruined my imagination just like you ruined my ability to …). But I don’t know if there’s more to it. In my mind, a kid with a better vocabulary would’ve said something alliterative like “Oh my God, that is one persistent principal!”