From the name of it, I'd have to take a wild guess and think that it's something a DBA came up with the gather wait stats of some sort. If that's the case, I'd look at the scheduled jobs on the box to see if I can find it (you can also try querying the command column in msdb..sysjobsteps). I'd also look at the auto startup stored procedures to see if it's being kicked off from there.

As a last resort, I'd search through the syscomments table in all databases for something where text like '%wait_stats%'