Having a cock so small and retracted that it is not even worthy of being referred to as a cock. Rather, it appears to be a one-holed button against the pubic region, with a very slightly pronounced rim that is the skin around the shaft. The actual bulb of the penis is sunken below this rim and appears to be no more than a fleshy button like that found on a sweater or shirt.
My friend SamERazar is such an unfortunate soul. The poor bastard can not get laid for being laughed at. Apparently his cock is so small that it hardly protrudes from his fat body. Sam therefore will be referred to from now on as Buttoncock.