(programming) A style of dynamic typing in which an object's current set of methods and properties determines the valid semantics, rather than its inheritance from a particular class or implementation of a specific interface.

A species of duck, Aythya fuligula.

Alternative form of fuckaduck

(idiomatic) An unusual person, especially an individual with an idiosyncratic personality or peculiar behavioral characteristics.

A North American wild duck, Histrionicus histrionicus.

(idiomatic, intransitive) To depart quickly or exit abruptly, especially in a manner which does not attract notice and before a meeting, event, etc. has concluded.

plural of duck soup

A moderately large, broad-bodied duck, Stictonetta naevosa, native to southern Australia.

Anas laysanensis, an endangered dabbling duck endemic to the Hawaiian Islands

Anas diazi, a dabbling duck in the genus Anas which breeds in Mexico and the southern USA.