VALLEJO, CA (Feb. 5, 2016) – E-40 is back with a new banger titled “Slappin” featuring Nef The Pharaoh and D.R.A.M. The Bay Area Ambassador is giving his beloved fans a sneak peek of what’s to come on his highly anticipated upcoming albums dubbed “The D-Boy Diary 1 & 2.” Make sure to Follow @E40…