DYOR is an abbreviation for “Do Your Own Research”. Every Youtuber or Chart Analyst in Cryptocurrency space starts their video or post with DYOR.
ICO mania popularized DYOR when many fake projects were lingering around as legitimate projects. People were throwing money at any project without doing much research. The literal meaning for DYOR is that you should never trust an ICO project team or any random Youtuber or Chartist without first verifying any statements made with your own research.