But I'll be happy for you, cause you got nothin' to do
And I'll be singin' the blues, walkin' around singin' "Poor boy, poor boy"

from Jack White – Hip (Eponymous) Poor Boy Lyrics on Rap Genius

Meaning

Assuming the previous line is a reference to Meg, we could continue the assumption and interpret these lines to be a reference to the fact that Meg has stopped preforming and making public appearances (nothin' to do) and Jack has continued to keep busy with lots of new music and collaborations (I’ll be singin' the blues).

Moreover, the fact that Jack is singing, “Poor boy, poor boy” is ironic in that he’s singing the blues about all of these feelings, when in reality, everything is the exact opposite for him. He’s happier than he’s ever been.

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