Frayed jeans are jeans that have been purposely worn down by hand or through machine processes to the point where the threads of the jeans begin to unravel. This is done to give the jeans a more worn and rugged look.
The fraying of the jeans can appear in many sections– the top of the jeans along the waist, at the bottom of the jeans along the cuffs, or in the middle of the jeans along the legs or crotch. Fraying of the jeans can range anywhere from a subtle wear to gaping holes in the jeans.
The trend with jeans has been towards jeans with a more worn look, with many companies creating jeans that have washes and whiskers as if they had already been worn. This can be a good thing if you are going for a more rugged avatar, but is usually best done in moderation.
Some guys also like to personalize their jeans by letting them fray naturally from everyday use, rather than purchasing them pre-worn.