The nuts. Used mostly for Texas Hold 'Em. It is common for people to say "gg" after knocking someone out. When this occurs, the one who won the pot held Pocket g's for the nuts.
Any two cards can be pocket g's.
*** RIVER *** 9c 4c 6s 2h 9d
Villain: bets 9402 and is all in
Hero: calls 9402
*** SHOW DOWN ***
Villain: shows Th Td (Two pair, Tens and Nines)
Hero: shows 9h 4s (Full house, Nines full of Fours)
Hero collected 19304 from pot
Hero held Pocket g's with 49o