I've 'eard of it. Some dodgy bloke tried to sell me some in an alley once, said it was the real deal and thirty quid well spent. I said to him, that ain't love. That's a chemically induced phenomena. I kept the money and bought a rainbow instead.
A radio operator would ask: "Radio check -- how am I coming in?" A responder could say; "You are coming in 5 x 5 (5 by 5)". (This means that your signal strength and clarity are both 5 out of a 1-5 scale, where 5 is the best strength and clarity.)
You're welcome. I love a lot of Björk's music, and you will see me post some of them inside replies from time to time. Not only inside my own questions. :-)