Created with pink noise, sweeping phaser and stretching effect. The phaser in cool edit has funny preset called bubbles which gives unique sound to this effect.
A piece of some sound (short noise) repeated, then speed slide applied, like turntable spin from slower to original. Some high frequencies cut out of a more/less rhythmic noise sample laid over, quietly.
Sorry about the background noise dx, anyways this is my mii singing "do do de do". I recorded this for a funny remix of a project then shared it here!.
My 9mth femle scottish fold in the middle of her first estrous cycle making funny noises :) purring/squealing in the beginning, loud meaowing towards the end.