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toast (n.1)[toast 词源字典]: "a call to drink to someone's health," 1700 (but said by Steele, 1709, to date to the reign of Charles II), originally referring to the beautiful or popular woman whose health is proposed and drunk. The custom apparently has its origin in the use of spiced toast (n.2) to flavor drink, the lady being regarded as figuratively adding piquancy to the wine in which her health was drunk. Steele's story ["Tatler," No. 24] is that an (unnamed) beauty of the day was taking the cold waters at Bath, when a gentleman dipped his cup in the water and drank it to her health; another in his company wittily (or drunkenly) replied that, while he did not care for the drink, he would gladly enjoy the toast. Meaning "one whose health is proposed and drunk to" is from 1746. Toast-master attested from 1749.[toast etymology, toast origin, 英语词源]
witty (adj.): Old English wittig "clever, wise, sagacious; in one's right mind;" see wit (n.) "intellect" + -y (2). Meaning "possessing sparkling wit" is recorded from 1580s. Related: Wittily; wittiness.