Thread: office plankton

"Slacker" = Doesn't do much but reaps benefits.
"Bottom Feeder" Like a fish: eats scraps that fall to the bottom but still sustains it's self.
Not to be confused with "Bottom Dweller" = Doesn't have the skills to rise above his position.

Others I can't think of off the top of my head.

Some alternatives:

Office Monkeys
Paper pushers
Dilberts
Desk jockeys
Office drones
Cube dwellers

Many of these are critical of white collar workers in general, but they'd all get the point across in context, I would think.