M.O.B is an old thing with Bloods - all Blood sets use it, it doesn't really refer to a specific clique or anything; just means 'Member of Bloods' and they use the acronym because it sounds cool to them - same thing with his typing style: there's a certain fraction of niggers who claim Blood cliques that'll avoid the usage of the letter "c" and replace it with "x" in order to diss Crips who will likewise do the same shit with the letter "b" or add the letter "k" adjacent to the letter in order to represent "blood killah" - the world of gangs is an incredibly, violently autistic world of spiraling block-by-block tribalism with funny handsigns, most of them often having double-meanings now but a lot of them like to involve themselves in politics one way or another as of 2020, at least.
I wish, friendo.