The chant is rubbish. It was funny for about 5 minutes, now it's grown old. The chant sounds a little like we're booing him aswell.
Greg you're such a grumpy git. Lighten up abit. The irony of it sounding like a boo added to the chant - only saints related people would know what was going on. It hasn't grown old, using it at times rather than every touch is a better idea.
The chant should be used when comes onto the pitch as a sub, and when he does something awesome like some sublime skill, taking it past a defender or scoring a goal. That way it remains awesome, and one of my favourite chants. It's a bit much every time he touches the ball.