Sutton and Cheam are the two kinds of dirt into which all dirt is divided. 'Sutton' is the dark sort that always gets on to light-coloured things, and 'cheam' the light-coloured sort that always clings on to dark items. Anyone who has ever found Marmite stains on a dress shirt, or seagull goo on a dinner jacket a) knows all about sutton and cheam, and b) is going to some very curious dinner parties.
source : The Meaning of Liff
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