3+ pieces, extra 3% off Bullish means having a muscular physique, bullheaded, or optimistic about the stock market. Learn the origin, synonyms, and usage of bullish from various sources and dictionaries. Bullish means positive or upwards movement. If an investor says he is bullish on the stock market, it means he expects the market to rise upwards. 3 meanings: 1. like a bull 2. stock exchange causing, expecting, or characterized by a rise in prices 3. informal cheerful and.... Click for more definitions. Bullish definition: like a bull.. See examples of BULLISH used in a sentence.