1. To make a succession of slight sharp snapping noises: a fire crackling in the wood stove.
2. To show liveliness, energy, or intensity: a book that crackles with humor.
3. To become covered with a network of fine cracks; craze.
v.tr.
1. To crush (paper, for example) with sharp snapping sounds.
2. To cause (china, for example) to become covered with a network of fine cracks.
in the media: Snap, Crackle, and pop are the cartoon mascots of Kellogg's breakfast cereal Rice Krispies. They are named after the sound rice krispies make when they are dropped in a bowl of milk

1. To hum or sing softly. 2. To sing popular songs in a soft, sentimental manner. 3. (Scottish) To roar or bellow. Possibly of imitative origin. Originally "to bellow like a bull" as well as "to utter a low, murmuring sound" Etymonline

Sound of a beating heart. This seems the most common spelling, used in medical texts. Also: dup-dup; ba bum; plop-plop; thud-thud; pop-pop; Sometimes the heart is said to throb and throb is also thought to have imitative origin. (Yahoo Answers, 1, 2)

sound of rapping, knocking, or explosive. in the media: Snap, Crackle, and pop are the cartoon mascots of Kellogg's breakfast cereal Rice Krispies. They are named after the sound rice krispies make when they are dropped in a bowl of milk. Find more explosions.

1. to make a cracking sound, eg. snapping your fingers, or a camera making a photo (sound of the shutter). in the media: Snap, Crackle, and pop are the cartoon mascots of Kellogg's breakfast cereal Rice Krispies. They are named after the sound rice krispies make when they are dropped in a bowl of milk 2. the "sound" of someone's pride being hurt. this is another example of "non-auditory onomatopoeia". other examples: bling bling, yoink and shiiin