My new lady gave me Mercedes and a necklace with a solid gold key
Like the starter of a car, the opener of a door or two pounds of raw

from Lupe Fiasco – The Coolest Lyrics on Rap Genius

Meaning

The Streets wears a locket necklace and gives the key to Michael (literally “the key to the streets”)

The key also “unlocks” other items such as fancy cars and drugs (note the wordplay: a “ki”, is slang for a kilo (approximately two pounds) of cocaine (“raw”))

To help improve the meaning of these lyrics, visit “The Coolest” by Lupe Fiasco Lyrics and leave a comment on the lyrics box