When someone says that the market is very bullish, they are stating that we are in a bull market. This generally means that prices are going up and "charging" forward like a bull. Investors are throwing more and more money into the market. By doing so, the market goes up and investments generally look really good. This is a great time to already have your investments in place because you can simply watch your money go up, seemingly with any investment. Even the bad investments can still see small upward mobility in a bull market.