What is Msh?
1.
One who bitches about things he is not always fully informed of. Also, one who bases his (negative) opinion of something on an early example and refuses to change it when it has improved.
Great, now you're being an MSH.
See
2.
Make Shit Happen. To get something done quickly.
Lets go man, come on MSH!
3.
Man She's Hot!
refering to a bitch that is very much fuckable.
MSH! Damn, i'd love to get it up here crack!