Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: what you may call it

whatchamacallit

 noun
     
what‧cha‧ma‧call‧it [countable]
spoken a word you use when you cannot remember the name of something:
I've broken the whatchamacallit on my bag.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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