When to use it
Use it when something specific is blocking you, like access, information or a decision. Name exactly what you need and ask who can provide it. Struggling quietly costs time; a clear request usually gets sorted quickly.
Example
You: “To finish on time, I need access to the sales data. Who can grant that?”
Manager: “IT can. I'll approve the ticket today.”
In an email or Slack message
In Slack: “Blocker: I need access to the sales data to finish the report by Friday. Who should I ask?” The word “blocker” tells people it's urgent without exclamation points.