the proper pronunciation is 'man' but some Welsh twats say 'marn' and they say it about 4 times in each sentence. Marn is used a lot by Bald Monsters.
Bald Monster : Yeah Marn, comin out tonight like Marn
Person who does not like him : No, I dont want to
Bald Monster : Come on Marn, it'll be cool as fuck like Marn
Person who does not like him : No
Bald Monster : Okay Marn