Home › Words › S › sibcestsibcestsibcest means sexual or romantic relations between siblings.EtymologyFrom sibling + -cest.nounSexual or romantic relations between siblings.e.g.“There's no word yet on if this modern-day version of Cruel Intentions will have any sibcest, but if Cruel Intentions is any indication, this series will be sure to have some jaw-dropping moments.” — 2015 October 22, Khadija Dukes, “Cruel Intentions TV Series In the Works”, in Paste Magazine:Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.cousincest 71% match — Sexual relations between cousins. vs sibcest →twincest 68% match — Incestuous sexual relations between twins, or siblings who look very similar. vs sibcest →consanguinamory 65% match — Consensual adult romantic and/or sexual love between family members; consensual adult incest. vs sibcest →clubcest 63% match — Sexual or romantic relations between members of a club. vs sibcest →auntcest 62% match — Sexual relations with one's aunt. vs sibcest →incest 62% match — Sexual relations between close relatives, especially immediate family members and sometimes first cousins, usually considered taboo. vs sibcest →stepcest 61% match — step-incest vs sibcest →biosib 61% match — A biological sibling. vs sibcest →