A game in which somebody unexpectantly shows their nipples to someone else, while screaming "NIPPLE TAG!". The person who was tagged must repeat the steps and continue the game, regardless if they are male or female.
The game is usually started by a male in order to see other girls' breasts.

Adj. Something that is expected to have a long lifespan by virtue of having existed for a long time, based on the lindy effect, named for the New York restaurant Lindy's, coined by Albert Goldman and popularized by Nassim Taleb.