One who is at a glance awesome and astounding. One who seems like the best, until you start paying attention. A person in a hueymontado when they realize that they are the best and cannot be stopped (even though they are bad).
Noob 1: "Dude, I just started watching Hotshotgg, That guy is so good.
Dyrus: "Just watch a little more, you'll soon discover he's a huge hueymontado."