whatsitsname

Any object whose name one does not know or cannot remember or immediately bring to mind.

Japanese Meaning

名前がすぐに思い出せない物体または対象 / 名前を知らない、または思い出せないもの / 記憶にない名前の物

She handed me the whatsitsname and asked if I could fix it.

彼女は名前の出てこないあの物を私に渡し、直してくれるか頼んだ。

Sense（1）

Any object whose name one does not know or cannot remember or immediately bring to mind.

Hey, hand me the whatitsname, will you? I need to tighten the doodah on this thingummybob.

whatsitsnames

（ plural ）