Top Definition
A flash sideways is not a flashback, flash-forward or an alternate timeline. It posits what would have happened if one event didn't.
In the ABC Television show Lost, a flash sideways shows what would have happened if Oceanic flight 815 didn't crash on the island but instead landed in Los Angeles.
by babcock69 May 23, 2010

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Similar to a flashback or flashforward but shows events that would transpire if a character's life would have turned out differently than what happened in the original timeline.

This concept was first started in the 6th season of the tv series Lost.
Guy1: "Man, imagine what my life would be like in a flashsideways timeline if Emily didn't break up with me?"

Guy2: "I know man, I know. Just let the tears out!"
by MovieFreak1_O.o February 17, 2010

The Urban Dictionary Mug

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Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

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

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The Urban Dictionary T-Shirt

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).

Buy the t-shirt