'Blinding' on its own does not mean to curse. As a verb in its own right, it means what you'd think it means - to blind someone is to cause them to lose their sight.
However, there was at one time an exclamation/ mild profanity 'God blind me!' meaning 'May God make me blind'. Over time, this degenerated into the even less offensive 'Gor blimey' or simply 'Blimey!' which is what the exclamation sounds like in a traditional Cockney accent. This is still used by some people.
'Effing and blinding' as a fixed expression means swearing profusely, using both obscenities and blasphemy. The obscenity is 'effing' i.e. using the 'f' word, while the blasphemy is 'blinding' as in 'God blind me'/Gor blimey.
I hope that answers your question.