Everyone in the office mocked him as the boss's lackey for constantly flattering the superiors.

lackey 来自法语 laquais，最初指"男仆、侍从"，后来引申为"卑躬屈膝的人、马屁精"。这个词带有贬义，指那些为了讨好上级而卑躬屈膝、唯命是从的人。