It's describing a co-worker that relies entirely on his/her mouth to keep their job. Mostly but not limited to those that are complete lazy pieces of crap that talk shit about the co-workers that actually work hard just to try and make themselves look good enough to not get fired.
Ole Ricktard must be trying to get out of mixing today. I heard him in telling the boss I didn't fill the skid steer last night.
Laurence Rickard is an actor and writer, best known for his work in the CBBC series Horrible Histories. Not only does he write a number of the sketches, but he has moved from 'background colour' to main actor during the development of the show. Possibly his most loved character is Bob Hale. His Twitter account is known for containing daily pearls of wisdom (or gems of lunacy). Rickard has also appeared in the comedy series Balls of Steel and has written extensively for comedy shows over the years. He has a loyal following of obsessive/dedicated fans known as Rickardians.