nancy storynoun [ C ]
uk/ˈnæn.si ˌstɔː.ri//ˈnæn.si ˌstɔːr.i/also nancy tale, /ˈnæn.si ˌteɪl//ˈnæn.si ˌteɪl/Caribbean Englisha story about Anancy, a character in traditional stories from the Caribbean
a story that is not true and that is intended to deceive people:
That can't be true - it looks like a nancy story to me.