Australian and UK slang for "laugh in a pantpeeingly hysterical manner". Slowly moving into the American language via the evil slang-pushing mechanisms of the internet.

Cack (?), v. i. [OE. cakken, fr. L. cacare; akin to Gr. , and to OIr. Cacc dung; cf. AS. cac.]

To ease the body by stool; to go to stool.

Pope.

 

© Webster 1913.

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