Usually in form nosepick. In skateboarding: any of various manoeuvres performed with the nose or front wheels of the skateboard, especially one performed by balancing on the nose of the skateboard. Also: (in BMX bicycling) a similar manoeuvre performed by balancing on the front wheel of the bicycle.
Earliest in "nosepick grind" noun a manoeuvre that involves grinding the nose or front axle of the skateboard against a surface.
Early 19th century (in an earlier sense). From nose + pick.