thing·am·a·bob /ˈθɪŋəməˌbɑb/
thingamabob
n : something whose name is either forgotten or not known [syn:
dohickey, dojigger, doodad, doohickey, gimmick,
hickey, gizmo, gismo, gubbins, thingumabob, thingmabob,
thingamajig, thingumajig, thingmajig, thingummy]