Fall Out Boy - Snitches and Talkers Get Stitches and Walkers Lyrics Meaning

I think you are on crack!

Show me, show me, show me a starry-eyed kid
i, i, I will break his jaw
i won't, I won't, I won't let him get his hopes up
no-oh-oh-oh
and I will save him from himself
here's a picture with a note
"no, don't turn out like me"
it's only for your own good

thats saying that he doesn't want people to turn out like him. He doesn't want some young kid with all the potential in the world to repeat what he did.

'and haven't you heard
the word on the street is
"I lost it, called it quits"
get it into the sun,
out from behind the gossip'

don't listen to all of what you hear. Get your head out of the gutter and get a life.

'this story's getting old
a homewrecker with a heart of gold
keep you locked up in the trunk of my mind
keep, k-keep talking
keep this alive'

she a homewrecker but has a heart of gold. She knows whats she's doing, but still loves him. And keep this alive, is referring to their relationship.