I just discovered this talent show, where apparently being disqualified can mean getting slimed. There are a lot of full episodes on YouTube, but this is the only proper male gunging I found. A very cute and young judge, who decides to join the female contestant, gets an awesome coverage and there's a brief interview afterwards where we can see him fully drenched. I found a few other male slimings but neither the coverage nor the recording are very satisfying. As I said there are sooooo many vids I didn't have the time to check even a small fraction of them.

https://www.youtube.com/watch?v=YhyEBi2Q7Q0
Action starts at minute 37.

Man ... Those people outside the slime booth are all:

https://www.youtube.com/watch?v=HqnlWPsE7ps