The word 狗屁 (gǒupì) is formed by directly combining two crude, mundane concepts, 狗 (dog) and 屁 (fart), to create a powerful metaphor of something utterly worthless or nonsensical. It leverages the cultural perception of both items as being low, common, and insignificant; just as a dog's fart is considered the epitome of something trivial, offensive, and not to be taken seriously, the compound term becomes a vivid insult dismissing an idea as pure nonsense or "bullshit".