Noun
(skateboarding) A slide trick where the boarder stands on the center of the board, on the rail between the two axles.
(snowboarding) A slide trick, where the boarder balances the snowboard at its centre, between the two boot bindings, and slides along the width of the board.
Source: en.wiktionary.orgChris Nolan was the first person ever to land this trick. citation * Boardslide - a rider approaches an obstacle and slides the board—perpendicular with the obstacle—along the obstacle,with the obstacle in between the rider's feet. Source: Internet