The absolute best possible hand in a
game of poker which is using community cards. (Texas Holdem and Omaha most often) If you hold the "stone
cold nuts" there is no way anyone can
beat you in that hand. This is slightly different from just "nuts" because sometimes it is said you have a nut hand but there is a slim possibility someone could have a better hand. For example: An ace-high flush is often referred to as the "Nut Flush" since its the highest possible flush. But if the board is laid out correctly, somebody could possibly have a straight-flush, giving them the
stone-
cold nuts.
Lets say you are holding a pair of pocket 5's in a
game of Texas Holdem. Your opponent has J-10. The
flop comes Q-K-A all of different suits. Your opponent has flopped "The Nuts" Assuming you are crazy enough to continue with this hand, if the next two cards come 5-5, you would then have the "stone
cold nuts" (4 of a kind) HOWEVER, if the
flop was Q-K-A suited, even your 4 of a kind would not be the stone cold nuts, because you opponent could possibly have a Royal Flush. A Royal Flush, of course, is the stone cold nuts in ANY situation.