20 or Nothing is a phrase used by students in England to describe the type and strength of liquid in a vape. Mostly boys in school will use this to deter anyone from using weak liquid that doesn't give a rush or satisfies your nicotine addiction. It is alot like a "frat guy" saying in which you would shout in a toilet "20 or nothing" and people would reply "20 or nothing."
For example:

"What liquid do you have?"

"12mg shots"

"Ugh 20 or Nothing!"

Another example:

"Bois I got 20mg salts!"
"Ay 20 or nothing!"

"20 or nothing, 20 or nothing, 20 or nothing......
by Kev Lord Leo Spalding March 3, 2020
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Grown children moving back in with their parents delaying the “transition to adulthood” as marked by five milestones: completing school, leaving home, becoming financially independent, marrying and having a child.
Jesus, I am so fed up of dating 20-Nothings, going-nowhere-fast guys, with their arrested development!
by rperazag August 21, 2010
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