Definition of Thingumabob

Noun: thingumabob 'thing-u-mu,bÃ³b

Something unspecified whose name is either forgotten or not known
"she eased the ball-shaped thingumabob back into its socket";
- doodad [N. Amer], doohickey [N. Amer], dojigger [N. Amer], gimmick, gizmo, gismo, gubbins [Brit], thingamabob, thingmabob, thingamajig, thingumajig, thingmajig, thingummy, whatchamacallit, whatsis, widget, doodah [Brit], doobrie [Brit], doobry [Brit], thingo [Austral], dingus [N. Amer], doover [Austral], doofer [Brit], thingy, whatsit