Chief Keef just took to Twitter, his social media site of choice, to release a trailer for what appears to be a new song, appropriately titled "First Day Out." From the looks of the trailer, it appears that Keef and his GBE crew are back to their old ways of shooting quick videos at home and around the neighborhood. "First Day Out" is slated to appear on the rapper's upcoming Bang 2 mixtape. Check it out below.

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