Tā bǎ shǒu zhōng bǎojiànpǐn de gōngxiào shuō de tiānhuāluànzhuì.[Pinyin]
He talked the legs off an iron chair to advertise for the healthcare product in his hands.
Etymology
Originally referring to a Buddhistpriest expounding the Buddhist sutras, so flawless and persuasive that it moved the god of heaven, leading to a deluge of heavenly flowers.