I've stayed in the front yard all my life.
I want a peek at the back
Where it's rough and untended and hungry weed grows.
A girl gets sick of a rose.
I want to go in the back yard now
And maybe down the alley,
The “back” is where the area isn’t manicured. She isn’t necessarily talking about a backyard, as much as she is alluding to engaging in a life that is less sheltered than the one she lives in the “front yard”.
A Song in the Front Yard