Yes, children can use "SMH slang," but make sure to use it wisely and understand the real concern behind the chats. "SMH" stands for "shaking my head." People use it when something is silly, surprising, or doesn't make sense. For example, if someone says they ate candy before dinner, you might say "SMH" to show you think it's not a good idea. But always remember, kids should use kind and respectful words with their friends, even when using short forms like this. Parents should be responsible for these activities if done something auspicious or wrong. It’s okay to have fun with texting, but make sure to use it wisely that is the important thing for kids.