Siblings that fuck each other. Brothers on Sisters, Sisters on Sisters, Brothers on Brothers, Brothers on Brothers while their Uncle watches from the closet.
Setting: Father of 2 daughters at bar with a friend.
Father: “I walked in to my oldest daughters room Late last night to borrow her iPad & witnessed both of my daughters in bed in the ‘69’ position. WTF???
Friend: “Sounds like you’ve got a case of ‘Sibling Fucklery’
(buhk fuhk-ler): verb - a buck fuckler is a person who performs the buck fuckle. A buck fuckle occurs at the completion of a properly hardcore anal sex experience. When the penis is removed forcefully enough it creates a suction so great that it pulls out a length of the takers small intestine. The origin of the name buck fuckle comes from the tool that hunters use to remove a deers rectum/intestines after the deer has been killed.