I have done three games this year where from the stands I here them yell "Come on Blue, get in the game" "Call the foul blue". Being the amateur rocket scientist that I am, I noticed neither team was wearing the color blue and deduced they were talking about me. Why blue? My hair is a light brown, my wife makes sure I have the black polyester pants, the shoes are black. (One time I did have navy blue tights on, but not sure you could see those, I checked for rips)
Has anyone else been called "Blue"? Am I missing out on some great cultural phenomenon?

I blue one last weekend.
Diamond fans call umpires blue, yo?

Yeah, Fletch it comes from baseball.

I've coached baseball for the last 10 years and took my first basketball job this year. I had to work real hard the first few games to say "ref" instead of "blue" or "ump".

The same thing goes the other way. When Michael Jordan was playing baseball I remember sportscenter showing an interview after one of his games and Michael kept calling the umpires, "refs"

It's a baseball/softball umpire thing. When I umpired ASA softball, we wore the same Elbeco blue shirts that the US Postal Service wears. (Same manufacturer and everything, just a different patch on it.)

Players would always call umpires "blue". I always thought it sounded nicer than "Ump".

I had a coach continually call me blue one game. So I asked him if he was trying to insult me. He looked back at me kind of funny and I said, well, I figured you were because of all of the over-weight out of shape softball umpires you are used to and you were trying to lump me in with them. Stopped him dead in his tracks and he didn't say a word after that.