Adverse Audit Opinion
  
Like when a so-called friend tells you that your new Tropical Mists-colored pants (which you were very proud of, by the way, because you were finally moving out of your narrow fashion comfort zone like everyone said you should) look like someone switched out your Tide pods for Grape Fanta.
In finance, it's a similar vibe, but much more serious. Adverse opinions in this context come from auditors looking over a company's financial statements. And they aren't adverse opinions like "hey, I think you'd look better if you did something with your bangs." It's more like "your books are a mess and some people in your accounting department might want to contact attorneys."
If an auditor issues an adverse opinion (which rarely happens by the way) it means they think the financial statements dramatically misrepresent the financial situation at the company. Significant restatements and other major consequences can follow.