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.
source: WordNet 3.0
a basketball player who is able to make dunk shots
source: WordNet 3.0
an adherent of Baptistic doctrines (who practice baptism by immersion)
source: WordNet 3.0
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.