coworker zone 

Similar to the Friend Zone, the coworker zone is a lonely state you find yourself in after your attempts to initiate an outside-of-work friendship with a coworker are rejected. Can also be used as a verb – to be "coworker zoned" is to be denied friendship by a coworker, thereby placing you in the coworker zone.

I asked Charles if he wanted to hang out and work on the project some time, but he totally missed the point that I wanted to hang out and just said he wasn't really interested in working on the project. He totally put me in the coworker zone.

coworker zone by Perceptes September 14, 2012

The Coworker Zone 

Pretty much the brother of the friend zone, but indeed worse. She only wants to socialize with you at work. Say goodbye to any plans that you might've had with her, because she won't be seen with you unless it's at work.

Billy: I've tried to set plans up with her outside of work, but she never comes through. She agrees to while we're working together, but then she leaves me in the dark afterwards

John: You, my friend, have just been thrown into "The Coworker Zone".

The Coworker Zone by Brandon Antione August 28, 2015

coworkerzoned 

When a coworker, with whom you are friends, declares you to be "merely a coworker" thereby terminating the friendship.

My good friend at work, who happens to be very attractive and who I would totally ask out on a date if we did not work together, has totally coworkerzoned me. No more friendly banter or coffee talk. I have been demoted and expelled from the friendzone.

coworkerzoned by 45t3r15k April 15, 2014