They are both made-up. I'm afraid you'll cause even more universal confusion and eye-rolling if you use such a term in place of the simple and obvious "e-book display" or "e-book reader". Technically, since I'm the reader I prefer the former, but would never think of using a term that required it's own extra definition.
"What's that"?
"A lisuse."
"A what?"
"A lisuse"
"What's a lisuse"?
"It's a device for reading e-books... it's an e-book display."
"Why didn't you just say 'it's an e-book display'?"
"Because a lot of us e-book geeks decided in a forum thread that we were going to call them "lisuse".
"Ok, yeah - I'll have to run right out and get one... so when I ask for a 'lisuse' at Best Buy...<snicker, snort>"
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