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1.
When moshing or crowd surfing at an awesome concert, and suddenly your expensive smartphone falls out of your pocket and smashes to the floor.

This is followed by crowd crunch when you phone then gets trampled before you can get to it.

This word also has a second meaning of when you get dropped while croud surfing.
"Dude! I was at that sick MEGADETH concert, and totally had my phone mosh-dropped! I picked it up and the screen was shattered!"
by ME1307 July 04, 2013