megafog

megafog

(ˈmɛɡəˌfɒɡ)
n
an amplified fog signal produced by the simultaneous sounding of multiple megaphones, each pointing in a different direction
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014