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Cum Stain On The Pants Of Society 

It's a insult used on a person who is a pain or useless. The insult reffers to when a male ejaculates on his pants and a stain is left where the semen (or in slang cum fell. Hence the use of "cum") . It's acronym form is CSOTPOS. Used by many teenagers and is not understood by most teaches so it is higly useful.
Jim: DAVE DAVE DAVE!
Dave: Shut up you cum stain on the pants of society

spunk stain on the boxer shorts of society

A true fuckoff, the kind of person you wouldn't cross the street to shit on. pond scum, etc. used with prefix, 'you-'
similar to "sack of unwanted horse piss" and "long streak of piss"