When you are a beginner at something but you perform like an expert due to "beginner's luck".
When I was throwing a bowling ball at 10 pins and it went to the far left side (thinking I was gonna hit 0) I got dissapointed, but, then all of a sudden it bounced off the left side and hit 9/10 pins! That was epic beginner's luck!
a phrase representing pure luck on the first try.
Bill: Oh man, did you see that shot!?
Tom: That was beginner's luck!!