BOUXSKA,
YMR is just what our posse name is. we are just 22kids from mostly killington and sugarbush that all ski together a lot. We wanted to keep in touch over the summer and made a facebook group to talk in. Decided to name it YMR and it stuck.
Dunno know about LMUR so i can't speak to that.
As for the battle between the two. There literally isn't one. That group of kids arbitrarilly started saying fuck YMR in what i though was jest but since the snow started flying it's been seeming like more real hate. We all don't really care just trying to have fun and ski with our friends and like minded homies. We won't respond retort or retalliate against lmur because is all peace jah one love and shit over here. Oh heck, for the full list just go to
www.facebook.com/youngmoneyretarded
Thanks,
tl;dr