noun which may take the genitive case particle 'no'
Describes a person or attitude that is full of self-praise, often in an obvious or annoying way. The たらたら part adds a sense of something being excessive or dripping with it.
See also: たらたら
彼の自慢たらたらな話にはもううんざりだ。
I'm fed up with his boastful talk.
自慢たらたらに自分の成功を語る。
He talks about his success in a bragging manner.