the act of being passed in a prone position over the heads of the audience, especially at a rock concert.
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British Dictionary definitions for crowd surfing
the practice of being passed over the top of a crowd of people such as an audience at a pop concert
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012