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
I'm fed up with his boastful talk.
He talks about his success in a bragging manner.
Compound of 自慢 (boast) and たらたら (dripping, incessantly), suggesting bragging that flows on and on.