niddy-noddy
/ˈnɪdɪˈnɒdi/noun
1An idiot, a fool; a grotesque image. Also as adjective: stupid. English regional in later use.
2A hand-held device used to skein and measure yarn, consisting of a vertical central bar with shorter horizontal bars at either end offset at right angles to one another, round which yarn is wound in a figure-of-eight movement; a hand reel.
Origin
Mid 17th century (in an earlier sense). Reduplication of nod.