I was never the type of kid to wait by the door and pack his bags
And sat on the porch and hoped and prayed for a dad to show up who never did

from Eminem – Beautiful Lyrics on Rap Genius

Meaning

His dad bailed on him and his mother when he was just a baby
Also; as a little boy, Marshall would write letters and give them to his grandmother who would tell him that she would give them to his dad.

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