i will on my arse - A way of saying something is as likely as a goat wearing a t

A way of saying something is as likely as a goat wearing a top hat and dancing in a snowstorm.

I’ll be there when pigs fly, and I will on my arse when goats start singing opera.

You think I’ll show up? I will on my arse when hell freezes over and the moon turns into a disco ball.

I’ll be there when the sun turns into a sandwich, and I will on my arse when the sky starts talking.