%supernaculum%

adv. & n. [ NL., from L. super over + G. nagel, a nail, as of the finger, or a corruption of L. super and ungulam claw. ] 1. A kind of mock Latin term intended to mean, upon the nail; -- used formerly by topers. Nares. [ 1913 Webster ]

Drinking super nagulum [ supernaculum ], a device of drinking, new come out of France, which is, after a man hath turned up the bottom of the cup, to drop it on his nail and make a pearl with that is left; which if it slide, and he can not make it stand on by reason there is too much, he must drink again for his penance. Nash. [ 1913 Webster ]

2. Good liquor, of which not enough is left to wet one's nail. Grose. [ 1913 Webster ]