It has no particular meaning. My profile pic on IMDb was a face drawn on a potato, so it kinda fitted the image. Kept it for this site (for continuity purposes)
Mine is the one I used on the old IMDb boards. I started posting there during a period of watching war movies and documentaries while getting to better know my dad, who served. "Bravo" is military phonetic. I chose it to reflect the fact that I wanted to use these boards to talk about what I love and connect with people that way.
The underscore is habit taken from a programming language and probably the only thing I remember about it.
If I were to pick another name it'd be wtfrequency, because I'm actually okay with not always cheering everything. Also it pretty much sums up my take on the IMDb board closure decision-handling-aftermath which sent me here (thank you, MovieChat). And I'm an R.E.M. fan.