Ask the woman they forced to remove her nipple rings with a pair of pliers, she'll tell you how it goes

google

tsa pliers rings

for thousands of hits about it, including quotes from the tsa saying their officers were right in forcing her to remove them.

I would go for plastic or rubber ones instead, you stand a better chance at getting through.

Though it would be funny, what's that? I get easily excited and don't want to make a mess in your hand when you check me out