Kelsey's Balls

Can anyone tell me what the meaning of the saying, " About as useful as Kelsey's balls," means? I have heard it said many times, but no one seems to know where the saying comes from. Thank you. Carol

Could it be that Kelsey Grammer - the award winning comedy actor is also famously impotent? I think we should be told.

The saying has been around for many years, my husbands Grandfather used to say something similiar to it.. he said, tighter than Kelsey's balls.