dunker

Someone who dunks.

A person tasked with performing or training others in slam dunks.

A biscuit that is suitable for dunking in a cup of tea.

Any snack food suitable for dunking in sauce.

A kind of sonobuoy.

Active sonar, for aircraft purposes still largely associated with dunking, suffers less variability but often has less range. […] Development of both dunkers and sonobuoys continues towards lower frequencies, implying bigger arrays, and deeper deployments.

Then they drop the dunker into the water and spin it around a few times so you end up upside-down.

One of a religious denomination whose tenets and practices are mainly those of the Baptists, but partly those of the Quakers.

A member of the Church of the Brethren.