The acronym "yh" is an informal shorthand used primarily in texting and online chats to mean "yeah" or "yes." It is a quick and casual way to express agreement or affirmation, often used in informal conversations among friends or in social media messaging. It can also sometimes mean "you here?" or be used as an expression like "Yahoo!" depending on the context, but its most common usage is as an abbreviation for "yeah" or "yes".