a man who lusts for the balls of another man, which is gay as crap.
it could also be a chick lusting for a man's balls, which is not gay, but it is best if used to insult your friends or commit hate crimes.(not that i condone hate crimes, because they are also gay as crap.)also, it could be used as a measure of the shine or glare from a nut sack.
1. though he never came out of the closet, all of the other men knew jeremy was a total ball luster.
2."this bitch was all up on my nuts. she was a total ball luster
3.when me and dave were making rotisserie chicken, his ball luster practically blinded me.