whachamacallit

from The Collaborative International Dictionary of English v.0.48
whatchamacallit \whatchamacallit\, n.
   Any object whose name is forgotten, or not known. [Also
   spelled {whachamacallit}.]

   Syn: thingumbob, doohickey, dingus, whatsis,
        what-do-you-call-it. [PJC]
    
from The Collaborative International Dictionary of English v.0.48
whachamacallit \whachamacallit\, n.
   Any object whose name is forgotten, or not known. [Also
   spelled {whatchamacallit}.]

   Syn: thingumbob, doohickey, dingus, whatsis,
        what-do-you-call-it. [PJC]
    

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