The squirrel part of this person is the manager's go to guy, yet has no ability to get the job done. This person will try to take credit for your work. When this person is assigned a task they will magically have something else in progress which means it will be assigned to you. Later, you will find out that they were off sleeping or fucking around wasting time while you were doing their assignment.
The weasel part of this person is the one who will point out any error you make to the manager no matter how insignificant. This person will have a huge ego coupled with extreme stupidity. This person only got the job because they know someone within the company. Somehow, your idiot boss will overlook this person's incompetence and give them promotions, raises, perks, etc.
worker 2 - I thought Bill took care of that project.
worker 1 - WHAT??!! I worked my balls off to get it done!
worker 2 - I heard Bill telling the manager that he took care of the project.
worker 1 - Fucking sqweasel!