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.
“The front yard” is a metaphor for a sheltered or protected life, in contrast with “the back”: a rougher, more dangerous, but (for the speaker) more thrilling and authentic-seeming life. 
 Brooks tended to worry a lot about “the kids these days” – see also  “We Real Cool”  – but wrote from inside their heads to try to understand their motivations.
A Song in the Front Yard