/ ˈblɑːni; NAmE ˈblɑːrni/ noun
[ U ] ( informal ) talk that is friendly and amusing but probably not true, and which may be used to persuade or trick you
ORIGIN: From Blarney , a castle in Ireland where there is a stone which is said to have magic powers: anyone who kisses the 'Blarney stone' is given the gift of speaking persuasively ('the gift of the gab').