From the words "what do you call it" or possibly "what you may call it".
"whatshumacallit." YourDictionary, n.d. Web. 15 January 2019. <https://www.yourdictionary.com/whatshumacallit>.
whatshumacallit. (n.d.). Retrieved January 15th, 2019, from https://www.yourdictionary.com/whatshumacallit
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