Low key basicaly means to keep it secret,out of sight, Hidden or quiet similar to" The down-low"
typicaly said by people who imitate and try to be Hip Hop usualy based of modern day hip hop imatation artists.
Essentially low-key imatations of imatations
The beta key is the one key to rule them all. It unlocks games like Dragon Ball D. It has powers beyond the power of a normal key, like your front door key. It can cure cancer. It can get you a blow job from a nerd in a dark alley. It can solve world peace. It can also unlock the nuclear codes from the United States and wipe out all of North Korea. But it primary purpose is for hanging shit on people who havent got the beta key. Because its so incredibly awesome and unlocks games like Dragon Ball D