1 definition by urbandictionaryisdon

It basically means the word 'Damn' but it's spelt how you would pronounce it.
*Hot girl walks past*

Guy: Dayum!

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*Chatting on social networking site*

Guy1: Did you see 'So+so's' profile picture?

Guy2: Yeah!

Guy1: Dayum, she's hot!
by urbandictionaryisdon August 26, 2011
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