Yeah '03, I went from quite filthy to filthy rich

from 50 Cent (Ft. Adam Levine & Eminem) – My Life Lyrics on Rap Genius

Meaning

50 Cent grew up in a povery-stricken urban neighborhood not having much. He began dealing drugs at the age of twelve, and that only proves how harsh his reality was.

However, he grew up to be one of the richest people in hip hop.

03 refers to the year he dropped Get Rich Or Die Tryin'

Going from “filthy to filthy rich” is another way of saying “from rags to riches,” or as Biggie would put it, “ashy to classy.”

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