No worries! Definition 1 of 2Pro Tip 1/3Casual Reassurance Used among friends to convey that a mistake or problem isn't serious. You spilled your drink? No worries, I'll clean it up! Pro Tip 2/3Response to Apology Commonly said after someone apologizes, to show forgiveness or understanding. Sorry I'm late - No worries, things happen. Pro Tip 3/3Cultural Usage Particularly common in Australia, used in informal settings. Can't make it to the BBQ. - No worries, mate!