I've spent a bit of time on the net researching the subject but it turns out I needn't have bothered:I could have just asked Younger Son.
'Do you know what a flatliner is?' says I, thinking I can impress him with my knowledge of what the young and hip people drink.
'Um, yeah, I had one on my 17th birthday.'
'Don't tell me that! I don't want to know things like that!!'
Then he asked me if I knew what a brain hemorrhage was. 'Oh, yes, of course I know that. It's also called a Bloody Brain. It comprises peach schnapps, grenadine and Baileys. The Baileys sort of curdles forming a clump-like brain onto which grenadine is poured until it bursts through, blood-like, hence the name.'
One comment I read recommended knocking it back quickly, in one swallow, so as not to gag on the 'brain'.
I'm so glad I'm not young any more.