It means crunching or corking your fingers. Put your fingers stiff and hunched, for leprosy effects. It can also mean hooking, ywing with a hook or hook and also staple or sew with staples.
In addition to the given definitions, it is also fixing pieces with grampas to prevent them from moving, it is a technique used by ceramists and restaurateurs.
GAFAR: 1. START OR REMOVE SOMETHING WITH THE UNAS.2. BAD LUCK.