My opinion...
I can only say thanks!!!
I've never heard this meaning before although it seems to be popular (here as well http://dict.leo.org/?lp=ende&lang=en&searchLoc=0&cmpType=relaxed&relink=on╖Hdr=o...
(was it because all my friends were honest and decent people who didn't have anything to do with moonlighting and never mentioned the word?? )