BELATEDLY, I'VE LEARNED that LOL means Laughing Out Loud, and POS means Parent Over Shoulder (i.e., change the subject, fast). Young people invented this shorthand for e-mail and instant messaging, and you can hear their attitudes and concerns in it -- for example, DYHABF (Do You Have A Boyfriend?), W/E (Whatever) and UW (You Wish).
I haven't been 20 for a long time now, and my thoughts don't always lend themselves to electronic communication; but they're common enough to deserve concise acronyms of their own. So feel free to use any of these abbreviations as needed:
Aging and memory loss
TMYNA: Tell Me Your Name Again
GU2P3XLN: Got Up To Pee 3 Times Last Night
WROMH: Where's the Rest Of My Hair?
SMB/SWU: Stiff Morning Back/Struggling With Underwear
MKDKWAPI: My Kids Don't Know Who Al Pacino Is
TCLTM: Teenage Cashiers Look Through Me
SIH->NM: The School I Hated Has Become a Nostalgic Memory
JL40WD (WHUA): John Lennon Was 40 When He Died. (What Have You Accomplished?)
ROTFC9: Rolling On The Floor, Call 911
SHBASH: Should Have Bought a Smaller House
SHSLY (^M): Should Have Sold Last Year (at Top of the Market)
NNRB: Need New Roof, Boiler
MIRPAA: Must I Really Paint Again, Already?
YGONTRTAFAM: Young Guy On Next Treadmill Running Twice As Fast As Me
HHDD: Hope He Drops Dead
PSY/NMI: Played Softball Yesterday, Need More Ibuprofen
NTFS/BO: NordicTrac For Sale (Best Offer)
EBYATT2: I'm E-mailing Because You're Annoying To Talk To
AHSR-SOOP: At High School Reunion, Saw Only Old People
GOFAM: Googling Old Friends After Midnight
Signing Off, Sideways