Present participle of cack; used as an adjective meaning excellent, funny, or extremely amusing (British slang).
The present participle of cack, formed by adding -ing. As an adjective, it's British slang with uncertain evolution—possibly from the verb or independently derived.
'Cacking' as an adjective meaning 'hilarious' or 'brilliant' shows how British slang recycles informal verbs into positive descriptors—something is so funny it makes you cack!
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