Is batting eyelashes a clear signal to guys that the girl likes him?

I was viewing a video on YouTube and one of the comments there was the inspiration for my question, the comment is: "Hmm it doesn't really look cute when its super super fast like that but I guess it does let a man know you like him, which is good because its hard to tell sometimes what ladies are thinking."

I am really wondering, do girls really think that? Is it 100% sure that when a girl bats her eyelashes/bats her eyes that she is indicating that she is interested in the guy?

I also wonder if it's a huge sign for us guys if it's done unconsciously - such as if you see a guy you like walk somewhere where you haven't seen him before and wasn't at all expecting to see him
Is batting eyelashes a clear signal to guys that the girl likes him?
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