DFTBA

DFTBA stands for Don't Forget To Be Awesome.

I found this note, as pictured, stuck on the last page of a library copy of 'Paper Towns' by John Green. I don't know the exact origins of the phrase but I think it was in some way invented/popularised by John Green and his brother Hank, who together run the 'Vlogbrothers' channel on YouTube, among other things.

So... DFTBA, Blippers! :)