Yep, quite a few threads about it
 
Usually it's the same as normal golf, but rather than a hole a small net is strung up to sling into.  
 
Here's a bit of information. http://slinging.org/forum/YaBB.pl?num=1330308336/50#50
 
CHOLT is somewhat of a taboo around our forum, mostly because it's very overpriced, but whatever. Plus C_A claims he came up with the exact same configuration long before CHOLT came about. But the thread does have good info on sling golf.