fanny /ˈfæni/noun 5forms 1phrases 1 noun5 •(US, informal) the bottom, the part at the lower back of the body that a person sits onChildren, sit down on your fannies, and eat your lunch.Get off your fanny and get back to work! •(UK, vulgar) The female genitalia.Her dress was so short you could nearly see her fanny. •(UK, vulgar) Women, regarded as sex objects.This club is full of fanny. •(UK, vulgar) Sexual intercourse with a woman. •(UK, slang) Mess kettle or cooking pot.I put on a big fanny of Ky, that is a straight-sided pot of cocoa for them returning. — 2005 formsfannies Phrases with fanny fanny aboutTo waste time or fool around; to engage in activity which produces little or no accomplishment.