A Gongler is someone who removes an entertainer from the stage when they do something that is supposed to be entertaining but turns out - it is not.
A good example of a Gongler would be the clown, "Sandman" from "Live At The
Apollo."
He would show up during a
bad act, get the performer off the stage, and do a bit of a
dance himself to entertain the audience as the next act is prepared.
"Did you see that show last
night about the man with his trained snails ?"
"
Dude, that was so
bad. The Gongler came out and swept him off with his broom."