Thingamajig

//ˈθɪŋəməˌd͡ʒɪɡ// noun, slang

Definitions

Noun
  1. 1
    Something that one does not know the name of. informal

    "He used this, this... this thingamajig you saw him with the other day to fix the problem."

  2. 2
    something unspecified whose name is either forgotten or not known wordnet

Etymology

From thingum or thingummy + jig, metrically patterned like gobbledygook, rigamarole. Compare thingamabob, etc.

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