Prescient

[Sarah]

Having knowledge of coming events; foreseeing; consciousbeforehand. Pope.Henry . . . had shown himself sensible, and almost prescient, of thisevent. Bacon.

[Sarah]

knowing before everyone-else, i.e. being a smart-ass - the kind of word utilised by someone who spends a considerable amount of time perusing large dictionaries in the hope of coming across obscure and rarely spoken words that they can try and integrate into their everyday conversation in order to impress his/her colleagues/friends.