the.com/doodad

means A small object or gadget whose actual name you can't recall, so 'doodad' fills the gap.

from An Americanism from the 19th century, cousin to a whole family of nonsense placeholder words — doohickey, thingamajig, whatsit — all born from the same human need to name the unnameable. Nobody can trace 'doodad' to a precise root; it's likely just a playful, rhythmic sound-coinage, the kind of reduplicated nonsense (doo-dad) that feels right before it means anything specific.