The forbidden grade that you receive when you know you are a fukking idiot and didn't revise or even listen to anything or anyone and probably have been adopted by a bunch of nonces
Jerry had a bad assessment and got a Z-.
by Jasd September 26, 2019
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The most badass letter of the alphabet. No acceptions
1: "What is the best letter ever?"

2: "Z, of course."
by AshleyRules100 May 29, 2010
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The inverted form of A++ (which is a French way of saying "see you later"). As a result, Z-- means "hello".
A Hey!
B Z--! You alright?
A Yes. Yes I am.
B Good. I have to go. A++!
A A++
by Orlandooo June 11, 2008
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