when you are indifferent about a situation, or just don't care about the situation. some other definitions of this word are being apologetic towards another person....also it can just be a form of greeting your friend (this is usually used in an extremely low-pitched type voice, as opposed to the normal usage of the word in a high-pitched voice)......the meaning of the word is clear by the context in which you use it in
When Andrew entered Daniel's house, he immediately said DAHHHH, and Daniel said, "O yo whats up man"
Yo want to go to the beach? DAHHHH