STR8UP Meaning in Chat or Text Messages Online

STR8UP is an internet slang that is used to mean "straight up." It is often used to indicate that someone is being honest or sincere in what they are saying. For example, if someone says "STR8UP, I think you're making a mistake," they are saying that they genuinely believe the person is making a mistake and are not just saying it to be mean or sarcastic. Another example could be "STR8UP, I'm not interested in going out with you," which means that the person is being honest about not wanting to go out on a date.