Another hilarious detail (except the dance moves, overall performance and lyrics) is they call themselves The Inglorious Baxters (Baxter is their family name).
In case you can't find the words to write your own revenge breakup song, take a cue from this masterpiece of metaphors:
So wave goodbye to my pie rack. (Her pie rack)/My pie rack (Her pie rack)/Pa pa pa pa pie rack
Shouda have thought of me as more than just a snack./The content of my character, not just the content of my rack. (Oooh)