I was recently subjected to a feeble and mildly irritating insult from someone wearing too much makeup, a silly hat and an EFY t-shirt. It took little time to shrug off the attempted insult, but I did have to struggle to figure out what on earth EFY stands for.
Then it hit me: Everybody Fuck Yourself.
But no: that's only what it SHOULD stand for, or, God willing, what it WILL stand for in the future, most of the time. Currently, its main association is with BYU's Especially For Youth program. Which I think is what the t-shirt wearer was involved with.
But as a bit of internet slang, EFY has a lot of potential. Just lost a flame war? Bow out with the parting shot EFY. Thinking everyone you're talking to is a stupid douchebag who should, well, fuck themselves? Just write EFY and they'll get the message.
I encourage you to find uses of your own for this vibrant, useful and exciting acronym.
TTFN! (Yeah, I'm old school. I prefer that to TTYL.)