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to do foreigners (or a foreigner): Common British slang for unofficial work.
(see entry foreigners by Cree$e:) unofficial work often making use of company equipment/ time/ premises but solely for personal gain, unrelated to the interests of the company and/or tax department. With notable exceptions, doing Foreigners is a fairly accepted part of British working life and, depending on the workplace, can even be done with managemental consent.
I'm not coming to the pub this lunchtime, I'm staying at work to do a foreigner for a mate of mine.
by EagerestTranslator January 07, 2012