a horn that used by a guy to warn other guys know that a grenade (ugly chick) is in the area.
Thank God Paulie sounded off the Grenade Horn so I could hide from her before she saw me.
by italian76 January 23, 2011
1 more definition
A horn that alerts all of Seaside Heights that there is a grenade walking around.
I spotted a grenade walking towards the club, so I immediately grabbed the Grenade Horn to warn all the club patrons.
by ThePerfecttSet January 21, 2011