I've never been much for coming up with chants. Actual creativity, you know, not really my bag. But I think this one can stick, provided we remember it long enough for it to be relevant.
It's a call-and-response style, you know what I mean. The tune is familiar enough.
Call: Oh, Begovic!
Response: Oh, Begovic!
Call: Can burn in hell!
Response: Can burn in hell!
All Together: Oh, Begovic can burn in hell.
'cause he's fat, stupid and a traitor,
oh, Begovic can burn in hell...
(repeat until apocalypse)