Contextual Analysis of "mmm hmmm" in Lyrics

i'm gonna teach you a lesson in loveology

yes i will

i'm like a man running out of time

i laid my heart out in that envelope

dancin' on the tailgate in a full moon

you're lookin' so good in what's left of those blue jeans

you hurt me so bad

baby

please don't use those same excuses you've used before

you told yourself so many times it's okay

start

lost in a crowd

start

hmmm hmmmhmmm hmmm hmmm hmmm