Noun: a form of entertainment derived from sianna entertainment. Often includes Lion-ism, biting, frolicking, making odd noises, yoga, and engaging in random activities at all hours of the day and night. Siantertainment can sometimes be considered dangerous and all those being entertained should wear protective gear at all times
Person 1: Im so bored right now!
Person 2: I know me too! I want Siantertainment!
Person 1: That sounds fun! I'm definitely down for some lion-ism