Dictionary
wha•cha•ma•call•it
Pronunciation: (hwuch'u-mu-kôl"it, hwoch'-, wuch'-, woch'-), [key]—
n. Informal.
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.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.