To show affection twords the other person in a relationship while sitting or while in the same area as a bunch of single people. Generally the comment, "Get a Room!" Is said by someone in the party.
Single Guy 1: "Man me and my buddy went to the bar last night and this couple just started fucking Canoodling right next to us!"
Single Guy 2: "Did you tell em to get a room?"
Single Guy 1: "Nah but my buddy did."