This is called scratching. DJs do this using a turntable.

VOA: special.2009.10.14

Abshir Ahmed,52, has lived all his life along a stretch of the desert near the town of Docol, Scratching the bone-dry earth with his bare,calloused feet, Ahmed says the devastation that he and others are experiencing now is worse than anything they have ever been through before.

VOA: standard.2009.10.06