What does "scarred for life" mean?

I f-in hate it when people say, " Man, if you watch that video your ***'ll be scarred for life man!" I mean, what is that suppose to mean, does it mean that i'll always be thinking of it for every second of my life I don't understand why people say that to try to scare people. I'm not... show more I f-in hate it when people say, " Man, if you watch that video your ***'ll be scarred for life man!" I mean, what is that suppose to mean, does it mean that i'll always be thinking of it for every second of my life I don't understand why people say that to try to scare people. I'm not saying it's bad to warn people, but you don't have to make it seem like they will never forget about it. Can someone explain?
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