An egghead song is a song of who's lyrics have content that nobody really cares about, such as with songs like "I Gotta Feeling" and "Boom Boom Pow" by the Black Eyed Peas. Those two songs are like "wtf? who the crap cares about that you "gotta feeling"? No one. That's right. No one." Egghead songs are questioned to why they exist, and why they are common amongst today's modern music, because people are going like "wtf" to so many different songs that it's not even funny anymore (haha). It's like, they're just trying to make you annoyed by their lyrical content.