The game is Big-O. It's holdem but 5 private cards instead of 2. Like Holdem, 2 private cards can be used to make a 5-card hand. 5 private cards simply generate more action.
Biggest difference comes in the Hi/Lo aspect. High hands are as normal, but low hands work like this:
1. Low hands must have 5x non-paired cards that are 8 or below to 'qualify' (Aces are High & Low)
Note: this means that the board must have at least three low cards for a low pot to even exist
2. Lowest 5 card hand wins (5 - 4 - 3 - 2 - A beats 6 - 4 - 3 - 2 - A beats 8 - 7 - 6 - 5 - 4 [this last one is the worst qualifying low hand, even 8 - 6 - 5 - 4 - 2 beats it])
High winner gets half pot, low winner gets half pot. Best scenario is you get the whole pot!
Fun game because there is tons of action, stacks get in quickly, and you get to see some big hands
Hope this helps.
Edit: Omaha "Hi/Lo" is the same thing as Big-O but with 4 cards. Regular Omaha (different than Omaha Hi/Lo) is exactly like Holdem but with 4 cards. They're all very similar games since they're variations of Holdem. Think of them as cousins with the same hand rankings but with very different strategy.
Other names for Omaha Hi/Lo are PLO-8 (this is pot limit), Omaha Hi/Lo, OH/L, O8+, Omaha 8's or better, Omaha Split, Omaha Split Hi/Lo, or any variation of this
Small pairs are the worst unless they also make a good low hand, because flopping bottom set in Big O suuuuuuuucks. Hell, even when flopping top set, you're flipping a lot post-flop if the board is any kind of wet.
