Ok, just for completeness, I'll add my version of the chorus - slightly differnt to the ones above but it's how i remember it. Audience response in parentheses too.

He's my brother; Sylvest.
(What has he got?) He's got a row of forty medals on his chest. (Big chest)(.
Killed a thousand soldiers in the west, he takes no rest.
Strong as an ox, big as a bull, dont push, just shove, plenty of room for me and you.
He's got an arm; like a leg. (Like a leg?)
And a punch that'll sink a battleship; (Big ship).
Takes all the army and the navy, to put the wind up. (Who?)
Sylvest.