thingamajig

[thing-uh-muh-jig] /ˈθɪŋ ə məˌdʒɪg/

noun, Informal.

a gadget or other thing for which the speaker does not know or has forgotten the name.

Also, thingumajig.

Origin

1870-75; thingum or thingummy + jig¹, metrically patterned like gobbledygook, rigamarole; thingum perhaps orig. from the gradational compound thingum-thangum (based on thing¹) with the same terminal syllable as in crinkum-crankum, harum-scarum, trinkum-trankum, the ultimately orig. of which is unclear

Examples from the web for thingamajig

Once its bat-winged supernatural thingamajig appears, the beast isn't half as horrifying as you imagined.
Other items available for rent include the slide, the basketball hoops, inflatable dolphin and inflatable thingamajig.

Word Origin and History for thingamajig

also thingumajig, 1824, see thing.

Slang definitions & phrases for thingamajig

thingamajig

noun

(also thingumabob or thingumadoodle or thingummy or thingamadoger or thingamadudgeon or thingumbob or thingamananny)An unspecified orunspecifiable object; something one does not know the name of or does not wish to name; dingus, doodad, gadget: When you want to go down you push this thingamajig up as high as it will go/ athingummy so addicted to lethal violence (entry form 1824+, first variant 1832+, others late 1700s+ or 1800s+)