Definition of outdraw
When a poker player hits a card that gives him the best hand when he was clearly not the favorite to win the hand, it is because he is hitting a card that gives him the best hand. If two players are all in at the flop, one with 77 and the other with 88 on a 7-8-2 flop and the turn brings a 7, then the player with 77 is said to have "outdraw" the player with 88. We could also talk about badbeat, de suckout, de one outer, etc.
To make outdraw, more frequent in Omaha than in Hold’em.
On the Hold’em, the outdraws are more marginal. As in the example presented above, the outdraw will occur 2% of the time, or 1 time out of 50, which is very little. In Omaha, the outdraws will be much more frequent by the simple fact that each player has 4 cards instead of 2 and that each new common card will dynamize the board in a new way. The difference in equity between hands is also lower in Omaha. If you take a hand of Hold’em, a very good hand may have 82% equity preflop against a not so good hand, that's a huge difference in equity. In Omaha, the good equity differences are more like 60%/40%.