Proper Tidy
Arsed
I've been on plenty and I know you are talking shit, you don't understand what ultra leftism is and instead have equated it with leftists (Leninists, Maoists, Stalinists) who spout mental shit, when infact it is they very groups and ideologies that denounce ultra leftism.
No, I know you mean it in the same way as ultra-gauche or left communism. I should imagine most of us mean it in the common sense ie some 'I'm more revolutionary than you anti anti fascista death to screws no pasaran where's my I-phone' type wanker. There also tends to be significant overlap between the two, not entirely co-incidentally.