The age between nineteen and twenty-one. Twenteen is used when the birthday boy/ birthday girl is not excited about no longer being a teenager and feel like if they mask the age behind a false definition, the pain of getting old will lessen.
Much Younger Best Friend: "Hey Jordan, how old are you turning today?"
The Birthday Boy: "I'm only twenteen! Just a youngin'! I'm not ready to be old yet."
Similar to eleventy-seven, an imaginary number to be used when you need to state a quantity. Unlike eleventy-seven, however, implies a higher quantity.
That drunk must have said "Isn't this great?" about twentyleven times!
A twenty-something who still acts like a teenager: still lives at home, parties every weekend, drinks energy drinks mixed with alcohol (see: FourLoko), thinks excessively about themselves.
Also see: twenteen
The cast members of the Jersey Shore are total twenteenagers. I just want to punch them all in their collective faces.