the plural of what. When more than one thing is involved, what-all represents all that is associated with something. People who say you-all typically also say what-all.
I'd like to learn to fly, but I don't know what-all is involved.
by Roger Hoppe December 18, 2006
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The Scotland Yard motto, according to the Simpsons (Season 16, Episode 1, "Treehouse of Horror XV," 7:55).
"Hey, what do all those British investigators say all the time?"
"They say, 'What's all this, then?'"
by CSFarnsley February 20, 2021
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int - The official Motto of Scotland Yard. Used to question the happenings at a scene. Also a very uppity way of asking "What's going on?"
Phil: Evenin', mates.
John: Evenin', Phil. Blimey! *shoots Phil*
Policeman: Right, what's all this, then?

Snob A: Good evening, old sport.
Snob B: Right, what's all this, then?
by Justin Briggs September 26, 2006
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The term is used for when someone says something that is a commonly used phrase.
Boy: “I’m sorry I can’t hangout I have to do my homework”

Other boy: “That’s what they all say!”
by Nephele April 21, 2019
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Monica denies that she likes it alot, but its really her most favorite song in ze world!!!
by The Man. February 21, 2005
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Someone who finds out the truth about are planet, and then is never seen again
Gary:What, its all earth?
Steve:Always has been.
by Goose with a goose brain July 14, 2020
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