What does "No worries, mate" mean?
It means no problem, or you're welcome. Adding mate gives the reply a friendly, informal tone when you agree to help, accept an apology or respond to thanks.
The saying in a sentence
The saying
No worries, mate
Example
Can you cover my shift? No worries, mate.
When you use it
Use it for everyday favours, small apologies and friendly thank-yous, such as when someone asks you to hold a door.
When you do not
Choose a more direct reply in formal writing or when someone needs a clear promise about an important task.