A tornado flew around my room before you came
Literally: His room is messy and looks as though a tornado flew through his room.
Figuratively: Frank was evacuated from New Orleans after Hurricane Katrina when he moved to California. The storm messed up his life before he came to Cali like it messed up his room.
Metaphorically: He’s referring to when you first let someone else get close emotionally. It’s never quite as perfect as you want so you blame it off on a freak occurrence, implying it isn’t the norm.
This is also the first reference in this song to the film The Wizard of Oz, the other being:
We’ll go down this road
Til it turns from color to black and white
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