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[Latin Fescennīnus, of Fescennia, a town of ancient Etruria known for its licentious poetry.]
rare scurrilous or obscene
[C17: from Latin Fescennīnus of Fescennia, a city in Etruria noted for the production of mocking or obscene verse]
fes•cen•nine(ˈfɛs əˌnaɪn, -nɪn)
scurrilous; licentious; obscene: fescennine humor.
[1595–1605; < Latin Fescennīnus of, belonging to Fescennia, a town in Etruria noted for jesting and scurrilous verse]