Lock Lock

1. Possessing the best possible high hand and the best possible low hand in split-pot games, usually Omaha/8.

Lock it Up

The term is most often used in Omaha eight-or-better games, where it is completely obvious what the best possible low hand and the best possible high hand is.

So, on a board of A45-6-7, the player holding 2389 will proudly declare "lock lock!" at showdown.