Green’s Dictionary of Slang

harpic adj.

[the eponymous lavatory cleaner, which uses the advertising slogan ‘clean around the bend’; thus pun on round the bend under round the... phr.]

crazy, insane.

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M. Kruger ‘Port Alfred in the old days recently’ at MartinKruger.com 🌐 I think it was Athol Emslie once at cricket who called a guy ‘Harpic’. When asked why, he said ‘’Cos he’s clean around the bend’.