As an adjective it is similar to such terms as "deez, cool, etc" but is most often used to designate somebody of elevated importance, strength or attractiveness.
As a noun it is a person who displays qualities of strength, power, increditability or coolness.
adj. "Dude, that guy from the book is straight up stoke"
Urban foppish dandy akin to the common "metrosexual", but without being a wholly loathsomne bastard. Clever and dapper always, a Stokes is one who does not believe in casual Fridays, unless it is casual sex Friday.
See also sexidigitize.