Entries on Urban Dictionary are just made up by sad people that need to get out more
www.urbandictionary.com/define.php?term=Skinning%20the%20rabbit&defid=5546027
( Amadeus I care not for your thoughts on grammer, Mon 26 Nov 2012, 16:22, Reply)

Broadly true.
...but I'd read of that particular euphemism in a dictionary of slang &taboo previously.
( Tab Hunter flicking Su Pollard's tiny cock, while she belms, Mon 26 Nov 2012, 18:06, Reply)