cockamamie UK /ˌkɒk.əˈmeɪ.mi/US /ˌkɑ.kəˈmeɪ.mi/noun 3adjective 2forms 3 noun3 •A foolish or ridiculous person.“What’s going down here, you cockamamies, we’re releasing two pictures this week about goddamn rich guys who get involved with their goddamn black tenants? What is this, an April Fool’s memo?” — 1970 •Ridiculousness; folly; foolish nonsense.Most of his ideas were pure cockamamie. One of them, however, was a real beaut. — 2005 •(US, old-fashioned) A decal, a design that can be transferred to a surface.Lo and behold, in full color there was a photograph of an old glass-paned hanging cupboard with clusters of strawberry, cherry, green grape and apple “cockamamies” pasted in the center of each pane. — 2000 adjective2 •(informal) Foolish, ill-considered, silly, unbelievable.Do not give any more cockamamie reasons for failing to complete your assignment. •Trifling. formscockamamies · more cockamamie · most cockamamie