Summer in the city, it's clear, it's clear, it's clear

The story:

I was singing this one day in health, because we love to sing Regina songs in health due to one of my friends who has a Regina obsession. So when I sang "it's clear", her and one of the other girls get these smiles on their faces. I demanded to know what was wrong, and they both crack up. 5 days later, one of them comes up to mean and says "Regina says 'cleavage', not 'it's clear'. we were laughing so hard that day, but I really felt like an idiot