Interjection, usually followed by an "unbelievable" event
Drunk brother: Man alive, did I have to shit!
Me: Congratulations. Now die.
Used as in the context of shock. Or awe. Usually when said it's exhaggerated. Also used to replace 'oh my god'.
1. Man alive!! (whilst perving at fit dancer in BCM)
2. Man alive that is beaut! (Whilst shopping and seeing a nice top)
3. Maaaaaan aliiiiive (As opposed to swearing whilst on a rollercoaster)