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whachamacallit

[hwuhch-uh-muh-kawl-it, hwoch-, wuhch-, woch-] /ˈʰwʌtʃ ə məˌkɔl ɪt, ˈʰwɒtʃ-, ˈwʌtʃ-, ˈwɒtʃ-/
noun, Informal.
1.
an object or person whose name one does not know or cannot recall.
Also, whatchamacallit, what-you-may-call-it, what-do-you-call-it.
Origin
1940-1945
1940-45; spelling of what you may call it reflecting affrication of t before y and reduction of vowels; compare similar metric pattern and internal əmə in rigamarole, thingamagig

whatchamacallit

[hwuhch-uh-muh-kawl-it, hwoch-, wuhch-, woch-] /ˈʰwʌtʃ ə məˌkɔl ɪt, ˈʰwɒtʃ-, ˈwʌtʃ-, ˈwɒtʃ-/
noun
Also, what-do-you-call-it
[hwuhd-uh-yuh-kawl-it, hwod-, wuhd-, wod-] /ˈʰwʌd ə yəˌkɔl ɪt, ˈʰwɒd-, ˈwʌd-, ˈwɒd-/ (Show IPA)
.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for what-do-you-call-it

whatchamacallit

n.

1928, compressed form of phrase "what you may call it." Earliest recorded variant is what-calle-ye-hym, attested from late 15c.

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for what-do-you-call-it

waffle-iron

noun

A sidewalk grating


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Difficulty index for whachamacallit

Few English speakers likely know this word

Word Value for what

10
9
Scrabble Words With Friends

Quotes with what-do-you-call-it