"Good riddance" is an English expression used to say that you're happy someone or something unwanted is gone. It conveys relief or satisfaction at being free from a person, thing, or situation that was troublesome or unpleasant. A shortened version of the phrase "good riddance to bad rubbish."
THE GREEN DAY SONG IS ABOUT A BREAKUP. The girl Billie Joe Armstrong was seeing in the early '90s, Amanda, dumped him, and he wrote this song as a way of saying, “It’s been real. See ya.” It’s like putting on a brave face, but in reality, he took it kind of hard.
"It's something unpredictable, but in the end it's right.
I hope you had the time of your life"