From WordNet (r) 3.0 (2006):
doojigger
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]