Green’s Dictionary of Slang

in possession of a penis of a given size or shape.

1974		‘C. West’ Young Hawks 79: Roland was bigger dicked but not by much [Simes:DLSS].
1986		B. McDonald (ed.) Cream 188: I was handsome and sexy and big-dicked for my age [Simes:DLSS].
2008		Alex Great Cock Hunt 29: [T]he guy at the urinal next to me, the long-dicked guy, had left [Simes:DLSS].