Having one's hole cards as two Jacks. Pocket jacks are referred to as "Hooks."

SoundPoker Says: Hooks are considered strong starting hole cards, especially in hold'em. They become even stronger when hitting a third jack on the board or what is referred to as a “set”. If not, be weary if an ace, king, or queen comes on the board.

See Also: Bullet's, Cowboy's, Dimes, Hole Cards, Jaybirds, Ladies, One Eyed Jacks, One Pair, Pocket Cards, Set