OGM2: Omniversal Giants Mark II
OG2: A variant of the above
TSOW: The Second Omniversal War, the first and current RP story arc
SOW: A variant of the above
AOI: An Omniversal Incident, part one of the SOW story arc.
OI: A variant of the above
E&O: Entropy and Order, the second installment of the SOW story arc
OG&D: Of Gods and Diplomats, part three of the SOW story arc
AHtG&PPPMOWJHtKoAJS&SC&bEAoC&E: All Hail the Great and Powerful Purple Portuguese Man O' War-Jellyfish Hybrid, the King of All Jellyfish, Sinomophores, and Similar Creatures, and by Extent All of Creation and Eternity
Okay, so no one really uses that last one. Too bad, too, because it just rolls off the tongue.