Hello. What does the underlined phrase mean? Does it mean "immediately"?
"You will do your project on lipstick," Miss Green said. "And if it's not the best project on lipstick I've e er seen, I'll flunk you so fast your head will spin."
It just means that it will happen very, very quickly.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.