Commonly used by stoners or skater dudes to address each other. Similar terms include 'Allriitte', 'Radical!' and 'Righteous!'
James Croft, He finds it funny to cut his hand and wipe the blood on a wall or maybe stick a thumb tack through his ear and into a wooden railing on a mobile building. So people shout 'dduuuuuuddddeeee' in his presence