Refers to dress shoes. Usually men's dress shoes because of the slippery, leather sole.
Whenever you wear a suit you have to wear slippery earls.
by Ron Collins November 28, 2007
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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
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A slippery marshmallow is when you accidentally drop the entire roll of toilet paper into the toilet while trying to wipe your ass.
Dude i just finished taking the biggest shit, and i pulled a slippery marshmallow and had to use one of your hand-towels.
by DrowningInMagots April 19, 2008
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Ejaculating in someone's mouth while they have retainers or dentures in.
Hey Todd! I gave your grandma a slippery frisbee last night!
by GuntherIII September 30, 2009
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Act of Pouring 10W-40 Motor Oil in a girls anus, and then having doggystyle sex with her.
Wow Jim I think I should have used 10W-30 cause when I gave her the Slippery Kenny, she almost went balistic
by Dan386 January 9, 2009
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One who knows the arts of being slippery
Patback is one slippery boi
by Patback6969 September 25, 2017
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Slippery dip is slang for slide used in Australia; often located in playgrounds.
Man 1: Hey kids want to go to the playground?
Child 1: Yeah, I love the see-saw.
Child 2: No.. I want to go on the slippery dip, It goes forever at the park.
by Flash Ash January 3, 2006
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