FWIW, I giggled too. I've heard of this pretty often, actually. I think it's not only chafing, but the sweating involved somehow. I've never heard it called "joggers nipple" though. *gigglesnort* An extra layer of cushion between nips and bra is what works, usually.
The ones I pity are the ones who never stick out their neck for something they believe, never know the taste of moral struggle, and never have the thrill of victory. - Jonathan Kozol