Etymology
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thingamajig (n.)

also thingumajig, 1824, see thing. Compare in similar sense kickumbob (1620s), thingum (1670s), thingumbob (1751), thingummy (1796), jigamaree (1824).

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Definitions of thingamajig

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

Dictionary entries near thingamajig

thilk

thimble

thin

thine

thing

thingamajig

think

think tank

thinkable

thinker

thinner