Top Definition
1. An illusion.
2. A fluke of bad lighting.
3. Irreconcilable confusion.

The metaphor originates from an image of a dress which gained instant internet notoriety because the lighting in the photograph caused the dress to appear unquestionably deep-blue & black to many viewers, and obviously white & gold to many others. The dress was actually gold and white, but the human eye's perception of the shades often causes misinterpretations.
1. An amputee may still feel the missing limb, but it is a blue dress. The senses betray.

Pedestrians were in awe while viewing a hole to the center of the Earth in downtown Manhattan. They knew it was a blue dress - a sidewalk painting that used perspective to trick their eyes- but it was incredible.

The advertisement for the fast-food hamburger was a blue dress. The burger looks completely different in reality.

2. Her date's appearance was a blue dress. He looked beautiful in white-light, and frightful in dim light.

3. The comedy act "Who's on first" is a blue dress. Few people even try to understand.
by OneMaleHuman April 26, 2015

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Photos & Videos
fellatio, bj. Derivation: Monica Lewinsky
Sweetie, how bout a blue dress session?
by snappy's February 05, 2008

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noun. Proof of infidelity
My sister won't believe her husbands cheats until she sees the blue dress.
by POAndrea February 06, 2008

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

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Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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

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