When a man rests his head on a woman's boobs, in a sensual/cuddling way, he is using them as a boobpillow. Often, the woman will run her fingers down his back, creating a very affectionate atmosphere.

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.