noun /ˈdɪŋɡəs/
a) Something whose name is either unknown or forgotten.
, 1979: ‘Say, whats that dingus you Britishers wear when youre playing cricket?’ — Kyril Bonfiglioli, After You with the Pistol (Penguin 2001, p. 241)
b) A fool or incompetent person.
I just lost my keys again. Now I feel like a dingus.
Wikipedia foundation.