Plump"er (?), n. 1.
One who, or that which, plumps or swells out something else;
hence, something carried in the mouth to distend the cheeks.
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, or to plump his vote.
3. A voter who plumps his vote.
[Eng.]
4. A downright, unqualified lie.
[Colloq. or Low]