too cool for school

English

Adjective

too cool for school (not comparable)

1. (informal) Very cool (trendy, fashionable, etc.).
   • 2014 December 23, Quinten Plummer, “Teens Show Thumbs Up to Instagram but Thumbs Down to Facebook”, in Tech Times:

     Firstable (the latest word for first of all, for those not too cool for school), the decline in teen users can be largely attributed to rival messaging apps and the public distrust of Facebook.