When someone has their nipple(s) pierced and you can see the balls of the jewelry through their clothing, making it appear as if they have three nipples on each titty (or pec).
See also triple nipple syndrome
Synonyms for triple nipple
On this page, you will find 30 slang terms related to triple nipple. Some of the top words include: Smuggling Peanuts, Pancakes, nipple flick, purple nurple, nippin', and 25 more.