nollie front-side lip slide
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Similar to a boardslide only the skater turns 90 degrees so that the trailing trucks are placed over the rail/ledge/coping and the skater slides on the middle of the board. Considered more complex than a boardslide due the rotation over the obstacle at the beginning into the trick and the re-entry or dismount. Note that in this case a frontside lipslide involves facing forwards while a backside lipslide involves facing backwards. Also known as a Disaster slide.
There is a great guide available for learning almost every single skateboarding trick in under 8 weeks.