The Collaborative International Dictionary of English v.0.48:
Bullish \Bull"ish\, a. Partaking of the nature of a bull, or a blunder. [1913 Webster] Let me inform you, a toothless satire is as improper as a toothed sleek stone, and as bullish. --Milton. [1913 Webster]WordNet (r) 3.0 (2006):
bullish adj 1: expecting a rise in prices