big talk

noun2

1. •
   Statements which are boastful or exaggerated.

   • Classmates remembered him as brash and jug-eared and full of big talk about his sexual experience. — 2007
2. •
   Major topic of conversation; current gossip.

   • At the annual livestock convention in Toronto's Royal York Hotel last week, the big talk was about Holsteins. — 1949