1.Does he mean he and she are the perfect couple?
2.From the lyrics below " What does worldwide mean?"
Who would have ever knew
That we would ever be more than friends
We're real worldwide, breakin' all the rules
She like a song played again and again
That girl like somethin' off a poster
That girl is a dime they say
That girl is a gun to my holster
She's runnin' through my mind all day, hey
From song : Replay by Iyaz
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Well, guns and holsters do go together and complement each other. That said, it makes more sense if he is the gun and the girl is the holster.