For many people the term MATURE4K is an acronym for Mature vagina, Young tongue, and Handjob. It was originally designed by a cougar who wanted to come up with a new name for oral sex and she wanted to use the word mature but without the word sex. So she came up with a catchall term that would be appropriate for either sex, as well as a phrase that her coworkers at work would be able to use to describe the hand job she was giving them, so she figured why not use the word cougar instead of calling it oral sex..