Etymology
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whatchamacallit (n.)

1928, compressed form of phrase "what you may call it." What-do-you-call-it is from 1630s. Earliest recorded variant is what-calle-ye-hym, attested from late 15c. What's-his-name for "unspecified person" is attested from 1690s; variant what's-his-face is first recorded 1967.

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Definitions of whatchamacallit

whatchamacallit (n.)
something unspecified whose name is either forgotten or not known;
Synonyms: doodad / doohickey / doojigger / gimmick / gizmo / gismo / gubbins / thingamabob / thingumabob / thingmabob / thingamajig / thingumajig / thingmajig / thingummy / whatchamacallum / whatsis / widget
From wordnet.princeton.edu

Dictionary entries near whatchamacallit

whammy

whangdoodle

wharf

wharfinger

what

whatchamacallit

whatever

whatnot

whatsoever

wheal

wheat