What is what does it mean when a guy bites his bottom lip?

When a guy bites his bottom lip, it can mean a few different things depending on the context. In some cases, it might be an involuntary habit or a nervous tic, and may not mean much of anything at all.

However, in other situations, biting the bottom lip can be a flirtatious or suggestive gesture. Some people view lip biting as a sign of attraction or sexual interest, as it can highlight a person's lips and draw attention to them.

Overall, the meaning behind a guy biting his bottom lip is largely dependent on the individual and the situation they're in. However, it's worth noting that body language is often highly subjective, and what one person sees as flirtatious might not be interpreted that way by someone else.