How to use the word bullish?

Sure, here's a description in the tone of a questioner: "Hey there, I've been hearing the term 'bullish' a lot lately in the world of cryptocurrency and finance, but I'm not quite sure how to use it properly. Can you help me out? What does it mean to be bullish on a particular asset, like Bitcoin or Ethereum? How can I tell if the market sentiment is bullish or not? And what are some common indicators or signals that can suggest a bullish trend is underway? Thanks in advance for your help!