Someone who is devious, cheeky and very naughty.
Because of these almost superhuman levels of deviousness, the actions of a 'slippery customer' cannot be easily controlled. Such characters can cause complete carnage in many different situations (any day of the week).
A 'Slippery Customer' is certainly not a valued member of society. In some cultures, using such a term to describe someone is the deepest form of insult.
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