Australian slang(?)
1. To laugh in a shrill manner
2. A humorous
situation that would induce such a laugh
Short for "cackle":
1. To make the shrill cry characteristic of a hen after
laying an egg.
2. To laugh or talk in a shrill manner.
"We were, like, at Maccas, and Sheila was
drinking a
milkshake, and like, she laughed and it came out her nose.
What a cack!"