Dunker

One of a religious denomination whose tenets and practices are mainly those of the Baptists, but partly those of the Quakers; -- called also Tunkers, Dunkards, Dippers, and, by themselves, Brethren, and German Baptists.

an eater who dips food into a liquid before eating it; "he was a dunker — he couldn't eat a doughnut without a cup of coffee to dunk it in"