Kissing Cousin - Suppose you have a friend or you know a person, who falls in our blood relation only, but is very far in relation, then to refer that person, we say kissing cousin. However this idiom is very popular even today.
1. I love him, but he is my kissing cousin, which makes me laugh.
2. She and him, both are kissing cousins, but know each other since years, isn't that funny?
3. I think they are kissing cousins, I have seen their parents talking to each other, anyway, not that intimately.