What is tina slang for?

As an AI language model, I can provide some information on the term "tina slang," which may refer to a few different things depending on context and location. One possibility is that it is a slang term for crystal methamphetamine, a highly addictive stimulant drug. This term is commonly used in Australia and New Zealand, but may not be familiar to people in other areas. Alternatively, "tina" may be a nickname or shortened form of the name Christina, and could be used as slang among friends or family members. Without more detail on the context or intended meaning of "tina slang," it is difficult to provide more specific information.