took a young buck. What is this clear gel/liquid surrounding meat?

There's a 1/8" thick clear (bubbles in some places) gel like layer/surround covering most of the outer meat on a small buck I killed. It's slimy, clear and with some bubbles almost like a hair gel (the bubbles, the look, and the feel). Much of this is under very thin easy to tear membrane that peels away like saran wrap (and is that clear). The gel has no strength but it's slimy and very hard to get off of the meat. It won't wash off. If I cut the outer layer of meat off, this does remove it but so far it's the only way I've found for removal.

Any idea what it is? The consistency is more gel like than say jello. Hair gel is the closest thing I can think of to describe it. The only other things I can think of to describe it would be snot or flem in consistency but this substance is almost perfectly clear. It's a little on the gross side but doesn't seem to have any smell and what I've cooked so far tastes good with little gamey flavor (I did cut off most of the slime layer).

I've never seen this before on a deer of the couple dozen I've cleaned or helped clean over the years. The deer was spine shot (brush deflected the bullet) if that gives any useful information. I'd say it was down a minute or two before I was able to finish the kill and was gutted within 30 minutes and quartered in 2 hours.

So far this one's tasted great... I think due to the age. It was about 100lbs and just barely nubs (not poking through yet). But that clear slime is a little on the weird side. I wonder if it has to do with the age.

hm61, I almost put in my original post that it was not silver skin (I'm familiar with that). All the deer I've worked with have had silver skin of course and that's an annoyance we all have to deal with in processing of course. But yes as JeffDilla mentioned, you could spread this on toast with a butter knife like jelly if you wanted to. Silver Skin is a meat grinder plugger. This isn't what I'm talking about here. This stuff's almost like the consistency of hide glue (when it's mixed and warm).

It doesn't seem like all deer have it (if they do I never noticed it - this one's covered in the stuff) and that's the part that's got me (why do some have it and some not).