Plŭmp'er, n.
n. 1. Something carried in the mouth to dilate the cheeks; a thing intended to swell out something else. Swift.
Sense 2. (English Elections.) A vote given to one candidate only, when two or more are to be elected, thus giving him the advantage over the others. A person who gives his vote thus, is said to plump his vote. Smart.
Sense 3. A full, unqualified lie. [Colloq. and low.]