Morrissey singing fatty this year

[mr.m]

I'm not sure if this has been brought up here already, but every time I heard him sing "You're The One For Me Fatty" on this tour he hasn't sang the line "all over.." or " and some..". Instead he kind of made a strange grunt, not too dissimilar to the voice of Jimmy from Blue Peter (for the thirty something Brits). I find it quite odd, I wonder if there is any particular reason behind it. Most probably not, and sorry for the terrible cliché, but it's so Moz.

If you haven't noticed it and are at all bothered ,here's a link..

http://www.youtube.com/watch?v=WJ74l_k1ctU&playnext=1&list=PL88BE34B3FAAF2EDD