Scrotium is good, I think because it's yet to outstay its welcome by being used in every post in a shouty PUBS NOMP SCROTIUM OUT way.
Plus ballbags are never not funny. Russell Brand'll back that up.
I know someone who wasn't giving the club a penny long before SHITSU arrived, no doubt in anticipation of what was to become of us. In fact they don't even like football and have never been, which means they're not even giving SISCUM the oxygen of attention. Now that's a real fan.
I like how people have taken Sisu and added 'shit'. It's like the dog but also indicates people don't like them! Shitfields is similar, but without the canine cleverness.