To cackle is to laugh in a loud, harsh way. Your dad's jokes might be so bad that they're funny, making you cackle every time.
When you cackle, people hear you — it's annoying to sit in an otherwise quiet restaurant beside a table of people who talk and cackle raucously. The sound the cacklers make can also be called a cackle, a squawking laugh that a chicken might make. Experts think there may be a connection between cackle and the Middle Dutch word for "jaw," kake, but it's most likely to be imitative, a word that sounds just like the noise it describes.