I've heard the following in an episode of a series and, while I understand the implied meaning of the word, I'd like to know more details about it (such as origin, usage, frequency etc.). I haven't been able to locate any resources on the net that referred to it though.
I wanted to clone a sheep, but I needed to start with something simpler. Which he is, because his brain is fliveck.
In fact, I wasn't even sure how to spell it so the spelling I'm using is provided by this link and I claim no responsibility that it's, in fact, right. Feel free to correct, should you see it fit.