crackling (Noun) — The residue that remains after animal fat has been rendered.
crackling (Noun) — The sharp sound of snapping noises.
crackling (Verb) — A series of short fairly quiet cracking sounds. ex. "the fire crackled" ex. "My Rice Krispies crackled in the bowl"
crackling (Verb) — Make a crushing noise. ex. "his shoes were crackling on the gravel"
crackling (Verb) — To become, or to cause to become, covered with a network of small cracks. ex. "The blazing sun crackled the desert sand"