Definify.com
Webster 1913 Edition
Plumper
Plump′er
,Noun.
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]
Webster 1828 Edition
Plumper
PLUMP'ER
,Noun.
1.
A full unqualified lie. [In vulgar use.]