This article is from the NARF--The Nifty Animaniacs Reference File FAQ, by Lee Cremeans wakky@yakko.wtower.com with numerous contributions by others.
Freunleven (spelling confirmed by "Mr. Director" himself, Paul Rugg)
has no meaning in German, Yiddish, Lewisian, Martian, or any other
known language. It's just a parody in broad terms of what Lewis
sounds like in his gibbering bits. Rather like using "pastafazool!"
to indicate Italian. Or, to quote Rob Paulsen, "It's just a nutty
word."
 
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