I may have done this before but didnt realize it.  How is it done?

Are we talking fly rod here?

Slowly move rod back to 11 o'clock leaving fly and much of the line still on the water, rest off the water in a large "C".  Then pitching the rod down to 3 o'clock which rolls the line up out and over. 

That one?

If you're talking about a roll cast on a bc rod - check out this: http://www.bassresource.com/bass_fishing_forums/YaBB.pl?num=1267278809/1#1

I actually meant the baitcaster but thanks too i was never much good as roll casting with my fly rod either would have saved me a bunch of time on those banks overloaded with trees

I have roll casted before and ive seen that video surprised i didnt notice it before ;D