whatchamacallit

/ˈwɒtʃəməˌkɔːlɪt/

whatchamacallit means A metasyntactic term used for any object whose actual name the speaker does not know or cannot remember; a doodad, gizmo, thingamajig, thingy. Lexicurio rates it Rare gem — a strength score of 79 out of 100.

whatchamacallit is pronounced /ˈwɒtʃəməˌkɔːlɪt/.

Etymology

Univerbation and contraction of what you may call it. United States, 20th century (recorded in 1921).

noun

A metasyntactic term used for any object whose actual name the speaker does not know or cannot remember; a doodad, gizmo, thingamajig, thingy.“The Thingamajig and the Wachamacallit.”