Heh, it's funny
I remember back one year when daddy had no money
Mommy wrapped the Christmas presents up and stuck 'em under the tree
And said some of 'em were from me, cause daddy couldn't buy 'em
I'll never forget that Christmas I sat up the whole night cryin

from Eminem – Mockingbird Lyrics on Rap Genius

Meaning

Eminem is describing how he was in a rough situation where things weren’t working out in his job and he wasn’t making it big and he didn’t have the money to bring a smile to his face

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