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)
A word created to define James Hetfield of Metallica. It was realised that no other term was quite as unequivocally correct, so was assigned to him by numerous Metallica fans...mainly female ones.