Since I don't know the exact context of this'man nair on balls story', it might be a story created by someone named Man Nair. Maybe it involves some kind of adventure or experience related to balls, which could be balls in a sports context, like soccer balls or basketballs. But without more information, it's hard to say for sure.
I'm not sure specifically what the'man nair on balls story' is as it's not a common well - known story. It could be something very personal or a made - up or very niche story within a particular group.