Top Definition
Someone that says they will do something then last minute backs out of it.
Matt promised he would come out tonight but he going to be sitting at home doing nothing, such a gup out!
by Man With Few Words February 17, 2011

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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A person who knows and uses all the chat rooms to troll and find friends, a gup out is also known as the most retarted person in your college class.

The fluff that stays and staines inside your jeans is often called a major gup out.
Seriously mate, your the biggest gup out I've ever met.
by Gubbzorz May 24, 2010

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

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