Joker-Quinn situation means in slang: The “Joker Quinn” situation is one type or style of “love situation”, where two people are in love. This scenario involves two people, a demented or insane person, and one who is normal. They fall in love and become friends, just like Joker and Harley Quinn. Harley Quinn was a psychiatrist before falling in love with Joker. (in Slang Dictionary, added by Ruby Davis)