Collins Concise English Dictionary © HarperCollins Publishers::

thingumabob, thingamabob /ˈθɪŋəməˌbɒb/ n
  1. informal a person or thing the name of which is unknown, temporarily forgotten, or deliberately overlooked
    Also: thingumajig, thingamajig /ˈθɪŋəməˌdʒɪɡ/, thingummy /ˈθɪŋəmɪ/
Etymology: 18th Century: from thing1, with humorous suffix



'thingamabob' also found in these entries:
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