Popularized mostly by 50s Rockabillys, a quiff is basically a forelock that is longer than the rest of one's hair on top, and is usually combed upwards (and back), or to the side, or made to hang over the forehead.
Depending on the wearers hair type a spot of gel or grease may be in order. Very stylish & manly. If done properly.
The quiff is often worn as a variation or 'evolution' on the very simple (and very manly) crew cut, or with the (longer & back-combed) 'duck's arse' or DA hairstyle.
There's lots more, but has anyone seen the massive quiffs on those Japanese high-school rebel kids (often the heroes of 'shonen manga' (Japanese comics for boys))?? They kick ass!
A hairstyle that is a variation on the pompadour, with a flat top and a heap of fringe in front, held together with lots of gel. Elvis wore one. Usually accompanied by sideburns.