An omoplata can be used as a submission, a sweep, and a setup for other submissions and sweeps. It's kinda difficult to describe in words, but it's basically applying a shoulder lock with your legs instead of using your arms. Usually you apply it from the guard, but it can be used in lots of positions.
Omoplata means shoulder blade in Portuguese. Gogo means throat in Portugese. There is no connection to the "plata" part of Gogoplata besides the fact that you throw your leg over the shoulder to place your foot underneath someone's throat.
If you're in RI, check out: -Omoplata Academy (in Wakefield RI, they've got classes geared towards self defense, fitness, plus they have a real good BJJ squad and MMA classes, and a 30-Day FREE Trial, which is definitely worth taking advantage of!) www.objja.com -Tim Burrill's BJJ in Providence (Mainly BJJ, but many students train MMA during open mat) -Team Santos MMA in Cranston -Triforce MMA in Pawtucket (Keith and Pete are the guys who run the place, and both of them are legitimate. Keith is one of the best grapplers around.) www.triforcemma.com or a 35 minutes from Providence is USMMA (Jorge Rivera's gym) in Bellingham, Massachusetts All good schools! Battleground in E. Greenwich is the choice in RI. My reason is that Battleground is huge! Has a full free weight setup with tredmills and S bikes like 15 heavy bags 2 boxing rings an mma cage and a huge matted back room where the classes are tought. Has a BJJ program headed by a BJJ blackbelt. However what makes Battleground superior is the striking programs. Boxing training provided by curent title holder Jaime Clampitt with a few pros hanging around sparring. Mauy Thai is run by William Shultz called Mongrel Combatives and is by far the best and most legit MT in the state. Most Muay Thai in RI is converted American kickboxing but not Battleground.