Drawing/painting a dick/penis
on the roof of
something so it can be seen by someone flying over. This word was
invented on the CNET podcast "404". http://www.cnet.com/8301-13952_1-10203032-81.html?part=rss&tag=feed&subj=Crave
see origin:
http://www.thesun.co.uk/sol/homepage/news/article2336886.ece