Omg... now I'm freaking out!!!

Thanks for the replies. Yeah, the substance, now grease I would agree, must be from the axle. I was moving it around alot trying to break the ball joint free when I did the LCA cause in all my preparation, I didn't think nothing about the separator tool, lol, and the passenger side sucker wasn't budging, it was past midnight so I might've got a little aggressive...

So my thoughts are maybe I separated the boot from the axle allowing the grease to come out, not cool.

I will search some and see if there are any threads on this, I appreciate your thoughts everyone, thanks!
(if you have any links it's helpful)