The way those people in the office grabbed snacks, they were acting like a pack of chimps.

chimps 是 chimp 的复数形式，chimp 是 chimpanzee（黑猩猩）的缩写形式，指灵长类动物中与人类最接近的物种之一，常用于比喻行为粗鲁或缺乏教养的人。