"Smob" and "smeb" - "Smob" is speed mobbing in Shallow Sea. Don't quote me on this one, but I think "smeb" is "speed mob end boss", "end boss" being Labtech X and the Sealab X mech he pilots. Basically, the crew cuts as swift a path as they can through monsters to certain points in the undersea areas, by mobbing. A Smob crew usually goes up to the Grunny Sub Commander and then suicides by Robofish, whereas a Smeb crew speed mobs all the way to the boss fight.
DMS is Deadman's Shadow, the most recently released area. It's in the mountain under Dead Man's Pass, and can be entered by everyone 10.0 and up by going through the gate by where Stoocie used to be.