"Oshigama" or "Omorashi" is an abbreviation of "holding in pee." You can enjoy watching someone writhe in agony as they try to hold in their pee, or you can hold it in until they reach their limit and then pee for pleasure. Some people enjoy "holding in pee" by drinking green tea, coffee, or alcohol, which have a strong diuretic effect, in order to build up the urge to urinate more quickly. However, since it's a live broadcast, some people wear diapers in case of an accident. Some people even broadcast the behind-the-scenes of pee-holding, so be sure to check it out.