A veiny penis or a veiny, hairy penis. Or one who hunts bar flies.
He was so old he got it up and had a spidercock.
Does it ever get old to go out and be a spidercock every night. Someday you'll settle down and not be such a spidercock.
A rare species of spider that have a cock attached to their body, usually found in Uganda
"LOOK OUT ITS A SPIDERCOCK!!!"