Meatotomy is incision into and enlargement of a meatus. When the subincision is only underneath the glans it is known as a meatotomy (or, if naturally occurring, a hypospadia). A meatotomy may occurs when a PA is torn out accidentally, but is usually done voluntarily as a clamp and cut procedure in order to open the urethra, often for sounding play.
It should be noted that meatotomy procedures tend to have excessive bleeding and infection is also a minor risk. Meatotomies usually heal in a week and tend to be far less difficult to heal than a piercing.
A meatotomy will have little effect for penetrative sex from either the meatotomized person's point of view or their partners, although it will improve manual stimulation for those that enjoy urethral stimulation. Anatomically, the urethra tightens immediately behind the glans, so this procedure can greatly improve access to the urethra for larger sounds.
Meatotomies usually damage the ability to urinate normally because they disrupt the urine spray, although this is definitely not always the case.