talk up a storm 口若悬河、滔滔不绝地说、夸夸其谈

【例句】
He is a doer, not an empty talker.
他是个实干家，从来不会夸夸其谈。

Right now he's talking up a storm about his adventure.
此刻他正在滔滔不绝地讲他的历险记呐。