Guayon
A guy who acts like a cocky show-off, a player, or someone who is overly confident and brazen. It is an intensified version of guay (cool) used to describe someone who thinks he is the man.
You are the typical high school guayón. Javi, you guayón! That guy used to be very preppy but now he is turning into a guayón. (The word jacobo refers to a stereotypical posh or preppy guy).
Automatically translated from Spanish
España