Engaging in stupid activities or stupid behavior. Generally applied to an individual in a light-hearted manner. When a person is being annoying, or making an ass out of himself.
Getting drunk and playing mail-box-baseball is widely considered asscockery.
When someone has received too much ass sex or hard toilet visits and has had a prolapse of the rectum, they will need something to keep the prolapse warm, this is an ass sock.
Marcus took it way too many times in the ass bro, he had an ass prolapse and now wears an ass sock to keep it warm from the pain.