comfortable bowel movement; regular bowel movement
Refers to a satisfying, easy bowel movement, often used in health contexts.
毎朝快便があると気分がいい。
I feel good when I have a comfortable bowel movement every morning.
食物繊維を多くとると快便
Eating plenty of dietary fiber leads to regular bowel movements.
good appetite and good bowel movements
Compound of 快 (pleasant, comfortable) and 便 (excrement, bowel movement).