Clapter is a word coined by Amanda Filipacchi in her 1993 novel Nude Men to describe the enthusiastic response to the avant-garde magician Laura who entertains her audience with "tricks" that require no actual magic but do demand an elevated level of sophistication on the part of the viewer in order to be appreciated.
"When Laura takes a Kleenex out of her pocket and wipes her forehead with it, everyone roars with clapter"
by Wankleton March 20, 2008
A "joke", often making a political or social statement, whose purpose is to make the audience applaud and agree instead of laugh. Popular with hack comedians and their fans.
Did Margaret Cho tell a single joke during that performance? Her entire show was just left-wing clapter.
by Dexy's Midnight Runner March 28, 2008