“Crap” is an informal and somewhat vulgar term. It is commonly used to refer to something of poor quality, worthless, or rubbish. For example, “This movie is crap” means the movie is of very low quality. It can also be used as an exclamation to express annoyance, disappointment, or frustration, like “Crap! I missed the bus.” In a more literal sense, it can refer to feces, but this usage is less common in general conversation compared to the other meanings.