thingumajig

noun

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

Synonym: doodad doohickey doojigger gimmick gizmo gismo gubbins thingamabob thingumabob thingmabob thingamajig thingmajig thingummy whatchamacallit whatchamacallum whatsis widget