How to use slow cooker for cooking meat without it turning into soup or stew?
As logophobe suggested in the comments, look for slow cooker recipes that aren't soups or stews. There are plenty, mostly in the direction of roasts. The general idea will be that you put a large piece of meat (and maybe some vegetables) in a slow cooker, with a very small amount of water (maybe half a cup), and you'll end up with some liquid in the bottom, but not a huge amount.

That liquid will generally be pretty flavorful, so most people would probably eat it somehow. One might eat it with the meat, turn it into a gravy, or use it in a different soup or stew. You should be able to make something pretty delicious; I wouldn't think of it as "watered down". But if you don't like liquid, you can throw it away.

If you don't like any of those ideas but it still seems wasteful (it is), I guess you might want to pick a different way to cook meat. Slow cookers are pretty much capable of stewing and braising, which can give you something pretty much like a roast, but there's always going to be at least a bit of liquid involved. If that's really not an option for you, the slow cooker might not be the best choice for you.