noun: One who plumps or swells out something else.
noun: That which plumps or swells out something else.
noun: (chiefly in the plural) A small ball or pad carried in the mouth to fill out the cheeks.
noun: In elections, a vote given to one candidate only, when two or more are to be elected, thus giving him or her the advantage over the others; a person who gives his or her vote thus is said to plump, or to plump his or her vote.
noun: A voter who plumps his or her vote.
noun: A downright, unqualified lie.
noun: (Internet slang) An obese woman, especially in pornography.