An overly optimistic stock market investor somewhat out-of-touch with reality. One who spreads false rumors with the intention of creating interest in a stock therefore increasing demand and a higher price. The pumptard sells the stock after it has appreciated and therefore benifits from the higher price. Pumptards usually spread their dubious information via online message boards.
Visa stock will be $200 per share by Christmas! Buy now! I am a Pumptard!