What is a doohickey?

"Doohickey" is a humorous and informal term used to refer to an object whose name you don't know or can't remember, or one that you simply don't want to bother naming.

It's a catch-all word for:

* Any small, unidentified object: "Where's that doohickey I use to open this thing?"

* A gadget or tool: "He used a doohickey to fix the leaky faucet."

* Something with a specific but forgotten purpose: "What's this doohickey for, anyway?"

Essentially, "doohickey" is a placeholder name when you need to describe something but lack the specific terminology.

It's often used jokingly, acknowledging the speaker's lack of knowledge or simply for comedic effect.