What is the song Mmmbop by Hanson mean?

The song mmmbop by Hanson means a moment in time. As seen in the lyrics:

You have so many relationships in this life, Only one or two will last, You go through all the pain and strife, Then you turn your back and they're gone so fast. So hold on the ones who really care, In the end they'll be the only ones there.

These moments, which can be instantaneous or long and drawn out happen in a mmmbop.