A piercing (usually performed with a ball closure ring or horseshoe ring) that goes through the thin piece of skin in front of the cartilagenous division of the nasal septum (between the nostrils)
That person has a septum piercing, i can see the ring
A piercing that makes one look like a mentally retarded bovine. Entitled first-world fauxhemians often get one to seem "unique", "edgy", and/or "outrageous". Arm yourself with caution, as they may bore you to death with diatribes about "cisgendered norms", "the patriarchy", and how monogamy is wrong if you enter their proximity.
So yesterday I got sooooo drunk while listening to the latest Animal Collective album and considered getting a septum piercing.