1) Usually a word frequented by the variety of human's native to Scotland known as NEDS (non-educated-delinquents).
2) Occasionally used 'ironically' by those incredibly witty 'stylish' and 'cool' people who post insistently on social networking sites or have extremely loud conversations in confined spaces.
Senga - 'Sir! amurny taking a pregnancy test!'
Teacher - 'Well get on with the work.'
Senga - 'Amur!'
Terry - 'Are you going to come out driving in my dad's new Zonda tonight and we can stop for a skinny latte on the way home?'
Paul - 'Aye amur'
Terry - 'Hahahahaah! Wow you're so funny!'