The word "坑爹" is formed by combining the character "坑", meaning to trap or cheat, with "爹", meaning father, creating a verb-object compound that literally translates as "to cheat one's father". In modern Chinese internet slang, this literal meaning is extended metaphorically to describe situations or things that are frustrating, deceptive, or unfairly disappointing, effectively using the exaggerated notion of betraying a paternal figure to convey strong disapproval or annoyance.