whatchamacallit

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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, whatchamacallum, whatsis, widget
• Hypernyms:
stuff