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A fast and easy way to say "what do you call it?" Can be used to describe a person,place or thing.
"Hey, you know were i can get a soda?"

"Yea, whatchamacallit is selling them at her locker."
by justin tha great July 10, 2008
when you forget something and you don't know what to call it!
"Isn't he, uh, you know, whatchamacallit?" "Gay?"
by Alex9999 September 27, 2006
Used when you can't remember what you were going to say.
I went to the movies and uh..whatchamacallit...yea...then I went out to dinner
by Lauren May 04, 2004