Factsmith

A person of dubious nature, who links unrelated facts together in an attempt to confuse, impress or intimidate another person with their worldly astuteness.

Theresa- "Like, OMG!!! Jonathan is so SMART!!!"
Mary- "Are you kidding me?!!! He's a total factsmith!"
Theresa- "Factsmith, ...really? There's no such thing as a "factsmith"!
Mary- Urban Dictionary, look it up!