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!"