A person who only one member of a group has met, but who is often mentioned in
conversation. Whenever this person is scheduled to meet with others in the group, something happens so that they never actually meet.
Origin: The Polkaroo was a character from a children's TV show. The show had two hosts and the
running joke was that the Polkaroo only appeared when one
particular host had gone to do something. He'd come back and say, "The Polkaroo was here? And I missed him again?"
Jenn: "You're here!
Remember that guy I keep
telling you about and want you to meet? He was just here
for dinner, but he had to leave early."
Amanda: "Oh! He's totally a Polkaroo."