look up any word, like bukkake:
 
1.
a person or thing that you know but have forgotten his or its name.
I met a whosie-whatsit yesterday. I cannot recapture his name right now.
by uttam maharjan December 06, 2011
 
2.
When you dont know the specific word for a noun
"mom, where's my whosiewhatsit?"
by billyjo103193 October 05, 2011