Only Mature — Thumbs

It is possible the phrase is a specific internal reference, a localized slang term, or potentially a typo. To help me find exactly what you're looking for, could you clarify the ? For example:

Is it related to a specific community or controller technique? Does it refer to horticulture or "green thumbs"? only mature thumbs

Is it a reference to a specific post, meme, or niche community? It is possible the phrase is a specific

Please provide a bit more detail so I can track down the right information for you. a localized slang term