It's a rollerblading trick, a sort of inverse Royale, where you jump on a 50stair handrail or curb with both feet, you knees curving in direction of travel, such that your front outside boot is touching the rail (see diagram) -->> __) )__ -->>
Or at least it was back in the day when people actually used to blade.
''Dude, that fahrvergnügen was sick. Or at least it could have been if you were actually grinding, instead of striking a whack pose, you bell''
Brought to public attention by Bob Woodward and Carl Bernstein in the book on the fall of Richard Nixon, All The President’s Men, ratfucker was Nixon’s term for a political operative who sows chaos among opponents; an agent provocateur. It is thought to have originated among campus political rivalries at USC, and seems to have some usage in the US military.
Along with Nixon’s other ratfuckers, Roger Stone caused fights at otherwise peaceful Democratic Party protests to generate a false narrative that the Democrats were violent and dangerous.