MEANING:  noun: Someone who presents as being obnoxiously clever.

ETYMOLOGY:  From smart, from Old English smeart + pants, short for pantaloons, plural of pantaloon. St. Pantaleone/Pantalone was a popular saint in Venice. As a result, it was also a common name among the Venetians. As a result, a comic character in the Italian commedia dell’arte was named Pantalone. The leggings this character wore became known as pantalone (plural pantaloni). And that became pantaloons in English. Earliest documented use: 1932.

SMARTY-PANT - covering for one leg, worn by a half-wit

SMARTY-RANTS - even Albert Einstein lost his cool sometimes

SMARTY-PINTS - ale promoted as improving one's intelligence