What is a song by a guy about a breakup that amusingly goes wa wa wa wa?

The song you're thinking of is likely "Na Na Hey Hey Kiss Him Goodbye" by Steam. Although it's not explicitly about a breakup, it captures the feeling of moving on from a relationship with its catchy refrain of "na na na na, na na na na, hey hey hey, goodbye." The playful and upbeat nature of the song makes it memorable and amusing.