1. "Rolling On My Bed"(Laughing). Closely related to Rofl. An acronym/verb that should be used when you choose to roll in your bed other than the floor
2. A universal verb that can mean any number of things.. and can often change depending on the user.
1a. The two appeared to be hooking up, but they were really simultaneously ROMB'ing at a funny internet joke.
1b. Omg what a funny joke! ROMB!
2a. I totally ROMBed that NooB just now.
2b. "Damn, dude.... I ROMBed that test."