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]

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]

WordNet (r) 3.0 (2006):

whatchamacallit
    n 1: something unspecified whose name is either forgotten or not
         known; "she eased the ball-shaped doodad back into its
         socket"; "there may be some great new gizmo around the
         corner that you will want to use" [syn: doodad,
         doohickey, doojigger, gimmick, gizmo, gismo,
         gubbins, thingamabob, thingumabob, thingmabob,
         thingamajig, thingumajig, thingmajig, thingummy,
         whatchamacallit, whatchamacallum, whatsis, widget]