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.
Who is that sneaking off into the cafe toilets?

I'm not sure, but i've heard he's a seriously Slippery Customer.
by MarcusHasMassiveTekkers February 20, 2011
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.
Who is that sneaking off into the cafe toilets?

I'm not sure, but i've heard he's a seriously Slippery Customer.

People like him have certainly derailed from the road to glory...
by MarcusHasMassiveTekkers February 14, 2011

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