Turns out the meat was bad...
As I was gutting him...pudd asked me if I cut into the guts (he was downwind)...I said no! But I did notice a different (not awful bad smell, just different) smell.
Well once they started skinning...they found a hole in his neck, like a pucture wound. Figured he got in a fight with another buck...any rate, he had NO fat from base of his head down to the front shoulders and it was full of pus. You could see the purple in the veins...like blood poisioning. Butcher said he'd been surprised if this buck would have made it through the winter seeing how he was already living off his fat.
Shame...he seemed like a big healthy deer...didn't even notice the hole in the neck...but now the smell makes sense!