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1.
When members of the Generation X "twenty-something" cohort settle down into jobs and lives they didn't expect or want or like. The Generation X lack of ambition in your 20's becomes pathetic when in your 30's.
I was at this bar last night, it was filled with yuppies and thirtynothings.

by Timbotron3000 May 28, 2006
 
2.
(adj. n.) When members of the Generation X twenty-something cohort settle down into jobs and lives they didn't expect or want or like. The Generation X lack of ambition in your 20's becomes pathetic when in your 30's.
I was at this bar last night, it was filled with yuppies and thirty-nothings.
by Timbotron May 25, 2006