Omo what? This sounds more like a breakfast than a deadly submission choke! The omoplata (sometimes referred to as ude-garami or sankaku-garami) is a commonly featured shoulder lock in Brazilian Jiu-Jitsu. The locking mechanism is similar to the kimura lock, but instead of using a figure-four, it is applied using a leg. The omoplata can be applied from the guard, by placing one leg under the opponents armpit and turning 180 degrees in the direction of that leg, so that the leg moves over the back of the opponent and entangles the opponents arm. By controlling the opponent’s body and pushing the arm perpendicularly away from the opponents back, pressure can be put on the opponent’s shoulder. It is also possible to put pressure on the elbow joint by bending the leg entangling the arm, and twisting it in a specific manner. Though an effective lock, it is more difficult than other armlocks to successfully apply.
From the guard, the performer places one leg under the opponent’s armpit and turns toward that leg, thereby catching their opponent’s arm. By pushing the arm away from the back, terrible pressure is put on the shoulder. Sometimes, depending on the emphasis put on the leg, an elbow can also be harmed.