When going to Boy Scout camp, the older scouts have to initiate new underlings into the troop. Thusly, they perfrom a "Moose Massage" which involves lying the recipient on their stomach, climbing onto their body, and humping their ass while wildly gesticulating in the air with your left hand. No not your right. Repeat back and forth motions until the underling moans like a moose, which signifies he is a true Boy Scout.

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.