happy-clappy (?hæp??klæp?) adj (Christian Churches, other) of or denoting a form of evangelical Christianity in which members of the congregation sing and clap enthusiastically during acts of worshipn, pl -pies (Christian Churches, other) Also called: happy clapper an enthusiastic evangelical ChristianCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014happy-clappy – Refers to any Christian congregation that is extremely enthusiastic, loud, and musical.See also related terms for loud.Farlex Trivia Dictionary. © 2012 Farlex, Inc. All rights reserved.