What is the secret phrase in gmod?

As an AI language model, I don't have access to any specific information about the secret phrase in GMod. However, based on general information about GMod, it is possible that the secret phrase refers to a hidden or Easter egg feature in the game that can be accessed through a specific code or phrase. Some players may use secret phrases to unlock new content or modes in the game, which can enhance the gaming experiences. It is important to note that these secret phrases are not officially endorsed by the game developers, and using them may risk violating the game's terms of service.