5 - wait a few minutes to speak, a parent (or guardian) is in the room

55 - coast is clear, we can talk about anything

AFC - Average Frustrated Chump

AFK - Away From Keyboard

ASAP - As Soon As Possible

ASL A/S/L - What's your Age, Sex and Location?

BBL8R - Be Back later

b/c - because

BF - Boyfriend

BFF - Best Friend Forver

BFO - Blinding Flash of Obvious

BRB - Be Right Back

BTW - By The Way

CLM - Career Limiting Move - badmouthing a teacher, the boss or supervisor while they can hear you, or hear about the event.

CTN - Can't Talk Now

CYA (C-ya) - See You Later

DD - Designated Driver

FFA - Free For All - Free online for anybody (usually message board spammers). old meaning: A wild fight

FWIW - For What It’s Worth

G2G - Got To Go

GF - Girlfriend

HHOK - Ha ha, only kidding

IDK -I Don't Know

ILU, ILY (ily, ilu) - I Love You

IM - Instant Message

IMHO - In My Humble Opinion

IRL - In Real Life (offline, NOT on the computer)

JK - Just Kidding

L8R - Later (I'll talk to you later)

LMA - Leave Me Alone

LOL - Laughing On Line (Or Laugh(ing) On Line

LQ - Laughing Quietly because someone is in the room

LYLAS - Love You Like A Sister

MOATM - Music On At The Moment

NM - Not Much

NOOB - newbie, someone new and inexperienced

NVM - never mind

OMG - Oh My God! (Oh My Gosh)

PDA - Public Display of Affection

PHAT - Pretty Hot And Tempting

PM - Private Message

POP - Parent is On Prowl, can't speak freely

POS - Parent Over my Shoulder, so watch what you say

PUA - Pick Up Artist

ROTFL - Rolling On The Floor Laughing

RSVP (French) - Repondez S'il Vous-Plait. "Respond if it pleases you."

SN - screen name

SOS - Sibling Over Shoulder, watch what you say

STFU - Shut the F... up! (edited)

THX - Thanks

TLF - True Love Forver

TMI - Too Much Information (like thinking about your parents kissing, getting 'hot", etc)

TTFN - TaTa For Now

TTYL - Talk To You Later

TY-Thank You

w/ - with

WE (w/e) - What Ever

WTF - What the F... (edited)

WTG - Way To Go

WTH - What the H...(edited)

WYSIWYG (wizzy-wig) - What You See Is What You Get

WYWH - Wish You Were Here

Y - Yawning (getting bored)

YGM - You Got Mail (telling someone you just mailed something)