One who attains self serving ends through (highly)passive aggressive means. Also applies to phsyical acts; i.e. line cutting.
1. Purposefully failing to cc a coworker on an email applying to that coworker's area of work (keeping them out of the loop for whatever reason). Telling the colleague you "forgot to add them" and apologizing profusely is an intregal part being a sniveler in this situation.
2.) Driving to the front of long lines of traffic waiting to, for example, get on a bridge or merge into a lane on the road. Hovering at the last possible point of entry long enough until some poor shmuck feels bad for you and lets you ahead of them. This is the ultimate sniveler move during rush hour traffic.
3. Throwing a piece of laundry into someone else's wash (sniveling it in)
4. Sniveling the last diet coke out of the office fridge but leaving the empty box. Thus receiveing the benefit of the last diet coke while:
1.) shirking the responsibility for trashing the cumbersome box and deciding whether or not it should be recylcled
2. avoiding being labeled as generally greedy for taking the last one