Slopie refers to someone that flies Radio Control gliders on a slope. For decades, RC enthusiasts have flown their rc gliders off cliffs and mountains where the prevailing wind will hit the slope and cause the air to rise, giving the gliders lift. Many of these slopes can be found along the coast lines of countries and also in the mountains inland.
The correct term for a ski jump on aircraft carriers. Used by has-been navies that can’t afford catapults (see Admiral Kuznetsov). Bri’ish “people” citation needed will insist that they’re actually called “champ ramps”. Ignore them.