What is when a guy replies with thumbs up?

When a guy replies with a thumbs up, it usually means that they agree with what was said or that they acknowledge it. Thumbs up is a way of expressing approval or confirmation without needing to say anything else. It is a casual and informal response, often used in casual conversations, group chats, or text messages. It is a positive sign that the person is engaged in the conversation and is listening to what is being said. However, it is important to note that this response can also be perceived as dismissive or unresponsive if overused or used in situations where more feedback or discussion is expected.