A person who is a bit of a dummy or slow, but not quite as bad as a total aguebao (a common Panamanian term for a complete idiot or jerk). It is used to describe someone who is mildly foolish or naive.
In the Dominican Republic, a Pariguayo is a derogatory term for a dork, a loser, or someone totally out of the loop. It describes someone who lacks street smarts, misses obvious opportunities, or is just painfully uncool and basic.
A Pariguayo is that guy who wears thick coke-bottle glasses and fixes the broken frame with tape: the one who parts his hair right down the middle: the guy who gets blamed for every prank at school because he is the one who gets left behind: the one who gets drunk off a single beer: or that guy who is your best friend and likes you but never dares to say anything.