whatchamacallit (noun)

1. She was wearing a trendy whatchamacallit, a unique accessory that caught everyone's attention.

2. The religious leader referred to the whatchamacallit as a sacred relic that held significant spiritual meaning.

3. During the archaeological dig, they discovered a mysterious whatchamacallit that belonged to an ancient civilization.

4. In the fantasy novel, the protagonist stumbled upon a magical whatchamacallit that granted extraordinary powers.