A man/boy that is a complete player/hustler They think themselves completely awesome and unbreakable hard nuts and total studs.
They make use for eye candy because of good looks but not much else.
person#1: Whats dan like?
person#2: Oh he's a maverick!
person#1: Oh damn!
maverick is a verb used when one is pwned, or more accurately, to be mavericked is more extreme than being pwned. When one mavericks, he becomes a maverick, which is the noun version of the word.
verb - Omg, that guy just killed me across the map with an Assault Rifle, he totally mavericked me.