ˈtrendyism [f.prec. + -ism.] = trendiness. 1977Spare Rib July 4/1 The coy use of Christian names..reminds me of the clubby, in-group atmosphere of competitive trendyism I found so depressing at the last WLM conference.1981Observer (Colour Suppl.) 13 Dec. 66/1 An encroaching tide of trendyism.