Sentences with Whachamacallit

I left my whachamacallit on the kitchen counter and now I can't find it.

The mechanic told me that the whachamacallit in my car engine needs to be replaced.

The teacher asked the students to bring a whachamacallit for the art project.

In the midst of the conversation, she forgot the name of the whachamacallit they were discussing.

The architect mentioned a unique whachamacallit that would be a focal point in the building design.

As a computer programmer, I often come across a technical whachamacallit that needs troubleshooting.