whoshamacallit 

Stand-in word used when you can't think of the right one. The "sha" is properly pronounced as in the French "Je".

Make it go faster by turning that whoshamacallit.

whoshamacallit by june t July 11, 2011

whoshamacallit 

word for when you don't remember somebody's name

I'll never forget old whoshamacallit who lives in Brandenburg

whoshamacallit by june t October 26, 2015

whachamacallit 

A word used when the actual name of the object in question will not come to mind. Very versatile but often very vague. It is derived from the phrase "what-you-may-call-it" which can be found in T. H. White's The Once and Future King.

Claire- "Hey, Adam, hand me the- the- you know, the whachamacallit."

Adam- "The what?"

whachamacallit by Cu2Au May 24, 2006

whosamacallit 

When you can not quite remember an individuals name.

Remember whosamacallit from the Marching Band?

whosamacallit by Theophilus North October 18, 2010