Top Definition
A relationship started with someone thought to be a sibling, but who turns out not to be
"-He's got a girlfirend who they all thought was a sister as she's the daughter of the woman who had an affair with their father, but it turned out shes not"
"- thats semicest man"
#incest #wrong relationship #semiincest #taboo #sexual abuse
by Alvinchipa September 02, 2009
5 Words related to semicest
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