What does this word mean: cowbell?

I ran across this word while browsing one of the websites.
The meaning is unfamiliar to me so any help will be appreciated.

The context:
This article needs more cowbell.
If you have expert knowledge of this topic, please feel free to add-on or make appropriate changes.
If not, leave it alone.

There is only one meaning of that word in my dictionary which is 'krowi dzwonek' so please skip it:)

Can anyone shed some light on this word?
Cheers!