Fuck You Attendant
The Fuck You Attendant is the bridesmaid or groomsman in your wedding party who takes up space so that you do not have to include a relative you do not like. The Fuck You Attendant is usually chosen shortly after the disliked relative states that they expect to be involved in the ceremony.
I know I'm just the Fuck You Attendant, but I'm so excited to be part of your big day! By the way, your sister is pouting at table 7.