Someone who pretends to be your friend in the hopes that they can eventually manipulate your friendly attachment to them into a romantic relationship
"Bob keeps pretending to be friends with girls, then passive-aggressively trying to guilt them into dating him because he's such a Nice Guy. He's a real friendzone predator."
The figurative hole occupied by those whose romantic feelings are reciprocated only by friendship.
Residence of the friend hole is most often due to the desired individual already having a boyfriend/girlfriend
Cam wanted to get there with Mackenzie but she already had a boyfriend so he ended up in the friend hole. (again)
A particularly aggravating metaphorical place, that people end up in when someone they are interested in only wants to be friends. It is impossible to get over someone while in the friendzone, because, as friends, you still see them too often for them to be erased from your memory, and yet, you cannot be with them the way you want.
Person 1: Hypothetically, how would you react if I told you I like you?
Person 2: I'm sorry, I don't mean to hurt you, but I want to just be friends.
Person 1 is now in the friendzone.
1) A man who goes above and beyond attempting to win the affection of someone they are attracted to but gets but in the friendzone anyway. Ser Friendzone is usually less self aware than the fabled [White Kinght].
2) Ser Jorah Mormont from George RRMartin's Game of Thrones book series.
Mike really needs to give it up with Holly, he's moving close to being SerFriendzone.