He's a player who's had limited game time at the top level and lacks the confidence to use his attributes effectively. I don't rate the bloke, and it will take a lot for him to convince me he's much use going forward - but booing him and jeering sarcastically when he gets subbed is just... sigh.
Never heard it like, where do you sit?
Gallowgate.
It's a minority, but it does happen.