Ooh I think I know that! "Poof" is used as a noun and means someone who's masculine in a feminine sort of way.

There's a definition (sort of) in Flying Booger's Half Mind Catalogue at http://www.half-mind.com/glossary.htm. There's also a downloadable songbook containing many rude hash-oriented songs. ("The Mayor of Bayswater's Daughter" is in there, for example, probably introduced by Rugby playing hashers.) The whole site, and the tradition of hashing is terrible un-PC and involves a lot of alchohol consumption.