Green’s Dictionary of Slang

(W.I.) a man who is both tall and lazy.

1928		R. Fisher Walls Of Jericho 26: He’s my boy. Ain’t you my boy, biggy?
1997–2000		College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 Biggie (noun and vocative) {offensive} Someone who is dark skinned and overweight. [Baltimore, MD].