Plural of 'dingus'—small gadgets, contraptions, or objects whose name you don't know or forget.
From Yiddish 'dingus' (a thing), adopted into American English around the early 1900s as a playful substitute for 'thingamajig' or 'whatchamacallit.'
Every language needs placeholder words for forgotten nouns—English borrowed 'dingus' from Yiddish, while we still use 'thingamabob,' 'doohickey,' and 'whatchamacallit'—they're our verbal shrugs!
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