This sound is from Killa Kan - Warhammer 40k Soundboard

Killa Kans bear many similarities to Deff Dreads, with their snipping klawz, chugging heavy weapons, and lumpy metal hulls. Yet in place of an enraged Ork, Killa Kans are piloted by cackling grots. Though individually smaller than a Deff Dread, Killa Kans charge toward the enemy lines in jostling mobs of riveted iron and roaring saw-blades. The Killa Kans' Grot pilots put their relative skill with firearms to good use, blowing the zog out of anything unlucky enough to cross their path. Despite being hardwired into a ten-foot tall killing machine, Killa Kan pilots still retain a good degree of Gretchin cowardice. As a result they still believe in safety in numbers, and have a bad habit of losing their nerve under fire. It is not unheard of for Killa Kans to waddle about in circles or freeze up entirely at the first sign of danger.