Thanks fer yer answers - this is in a spot right near the joint where the thigh meets the drumstick, and there are no signs of veins or anything that I would expect to be servicing a major organ like a kidney or lung or anything; I'm thinking the "Blood Pudding" answer might be the closest to...
Simple Question -
On the thigh of every chicken I've ever cooked, there's a little pocket behind the main bone, and there's a little spongey blob of something in there that scoops right out - it's kinda mealy, and I've never felt the urge to eat it, but my dogs sit next to me and drool...