I tend to blurt out “Cretin!” quite often, though when driving my usual abusive outburst when someone of advanced years makes a dodgy/unsafe manouvere (which is several times a day living where I do) is “You silly old bastard!”, regardless of gender.
This has to be the best outburst ever (definitely NSFW!): https://www.youtube.com/watch?v=7tJFgeerp5Q
I had an ‘incident’ with a van driver a few months back, quiet country lane, he had overtaken me once, fairly reasonably, but then had to stop when he met a lorry, there was room, so I went up the inside, while he was stationary, knowing he would be stopped for some time and it was safe for me to do so. Shortly after, further up the road, I was approaching a junction onto a main road, perhaps 20-25 yards away when said van decides he’ll overtake me again, despite me not being dawdling, his van being most of that length and the fact I signalling right. Without thought I flung my right arm even further out, almost across his bonnet, looked back and shouted at the top of my voice “Get back you c***!”. Scared myself to be honest, though I spent the next two miles home laughing to myself once the shock had worn off! My first real dodgy road experience like that, if I lived in London I can see me being banged up in the first week.