What is cowbell warrior?

It's not clear what "cowbell warrior" refers to specifically, as there are multiple possibilities. Here are a few potential interpretations:

• It could be a reference to the use of cowbells in traditional West African music, where they're often used to keep time and add a rhythmic layer to percussion ensembles. In this context, a "cowbell warrior" might be someone who's particularly skilled at playing the cowbell and contributes a lot to the overall sound of the ensemble.
• "Cowbell warrior" could also refer to the famous "More Cowbell" sketch from Saturday Night Live, which features Will Ferrell as a cowbell player who's overly enthusiastic about his instrument. In this context, a "cowbell warrior" might be someone who's particularly passionate about playing the cowbell (or about any musical instrument, for that matter).
• In a more general sense, "cowbell warrior" could simply be a nickname or moniker that someone has adopted for themselves. It's possible that there's a person out there who goes by this name and identifies with the qualities that the term suggests (e.g. being loud, percussive, or enthusiastic).

Without more context, it's hard to say exactly what "cowbell warrior" means or what kind of information is being sought.