This term originates among Rastafari, and nobody knows if it is mash it up, mess it up, etc. For Rasta, moshing it up means destroying Babylon System which means paying respects and praises and learning from the tree of knoweldge. Young rastas mosh it up when they resist
totalitarian police, when they
demonstrate, and when they fight. For thrasmetal fans, moshing it up is destroying conformity and defying authority. Typically seen in pits in front of stage areas, moshing it up for thrashers is a way to
demonstrate contempt for and agression to pressure. Typically involves slamdancing, skanking, agressive expressions of all types. Similarly, a thrashmetal musician can mosh it up when he/she is really good.
