Plumper meaning : Having a full and rounded shape; chubby, somewhat overweight. Fat. Sudden and without reservation; blunt; direct; downright. One who plumps or swells out something else. That which plumps or swells out something else. Hence, something carried in the mouth to distend the cheeks. 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. A voter who plumps his or her vote. A downright, unqualified lie. An obese woman, especially in pornography.