Just another spelling for "gray" in pluralis. Grays (sometimes spelled "greys") are supposed to be extraterrestial
intelligent non human
beings who are captured and held in secret labs deep within Area 51 and perhaps
the Cheyenne Mtn base.
In Sweden, the word "grejs" is translated to "a lot of physical things stuffed
up all around
"Dude, I saw some grejs last night! Or maybe
I had some bad moonshine..."
(Buddy, I saw some extraterrestial, intelligent
non human beings last night. Or perhaps I drank
too much bad home brewn strong alcohol...)
"Vad det ser ut här! Fan vad grejs det är här inne!"
(Look at that
mess! There is too much fucking grejs in here!)