Chick is originally an abbreviation of
chicken. Since a time long forgotten it has been used in a metaphorical way referring to women, primarily due to their genetically caused affinity to an hyperactive flow of talk, as well as other strong likenesses:
-they are easy to excite
-usually turn up in masses and seldom are
seen alone
-they get drunk easily
-their meaning of life is to eat and be eaten (out).
Mostly this last point has turned this word into a slogan of as much admiration a sensible man can give to a woman, i.
e.
Dude 1: Maan that chick is hot.
Dude 2: de one with da big tits or de one with the nice ass?
Dude 1: The one with the nice ass, the other is just a poster, dude!
Dude 2: Duuude!
Dude 1: Dude!!