That looks more like a tumor than a muscled up forearm to me. See how it just ends at the wrist and about 4 inches up from the wrist have no develpement at all. my forearms arn’t huge but I have a flowing muscle line tapering to the wrist atleast. Maybe I’m wrong and that is what a HUGE forearm is supposed to look like!.
But then again it is vascular the more I look at it, Holy shit maybe that is one solid coil of steel muscle under there!!!. Makes popeye look like a 14 year old holding a Victoria Sicrets catalog.