1) Someone of Hispanic, Latin, Mexican, etc. descent that acts like a know-it-all.
2) Someone that is very culturally versed in Latin and/or Hispanic customs or traditions.
1) You know that guy Carlos in accounting? That fucker doesn't know shit but he cuts in on all our conversations like he's a goddam spic-a-pedia.
2) Hey, Spic-a-pedia, what exactly are we supposed to do with this pinata?