Also known as: 咕咕嘎嘎, gugugaga
A trend first started by a MyGO!!!!! video that later gained fame in western platforms via AI-generated videos featuring the Female Endministrator (Arknights) from Arknights: Endfield in a penguin costume making baby noises. The penguin costume is an allusion to how the Endministrator is frequently visualized as a penguin by fans.