meaning "awesome", "cool", "hardcore", "classic","great" etc...can be used in context when discribing an object or a situation or an assesment of the general and overall coolness of something.
noun: to over-estimate one's own self-worth. with particular reference to physical attractiveness, which includes: weight, hair, face, style and breast size.
includes overestimation of intelligence (possibly a mention of MENSA), disregard for others and the inability to identify one's flaws.