A co-porker is a female who enjoys sleeping with married men at work. They can hardly be called a co-worker as that would imply that work is being accomplished. Rather, they spend their time porking. Co-porkers are usually trashy and have herpes.
"My husband treats his office like most men treat a pick-up bar. He always seems to find the office co-porker within two weeks of beginning a new job."
"Colleen is the office co-porker, go ahead and take a shot at her, the rest of us already have."