One who is a two faced, backstabbing, freak. This is also used for dogs and children with hyperactivity disorders.
Mary, you are a friggin' flip case.
Jose! RUN! There is a flip case running toward you.
Marlene over there is a flip case.
by Fly-J May 28, 2007

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Top Definition
A person who, while seeming normal, could "flip" in an instant to become their darker self. You can usually spot their intensity, boiling just below the surface.
Different from nutcase who always shows their lesser self.
"You know he's a flipcase so watch what you say."
by JohnCanon March 30, 2010

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt