2F4U 

Too Fast For You

4YEO FYEO

For Your Eyes Only

AAMOF

As a Matter of Fact

ACK

Acknowledgment

AFAIK

As far as I know

AFAIR

As far as I remember / recall

AFK

Away from Keyboard

AKA

Also known as

B2K BTK

Back to Keyboard

BTT

Back to Topic

BTW

By the Way

B/C

Because

C&P

Copy and Paste

CU

See you

CYS

Check your Settings

DIY

Do it Yourself

EOBD

End of Business Day

EOD

End of Discussion

EOM

End of Message

EOT

End of Thread / .. Text / .. Transmission

FAQ

Frequently asked Questions

FACK

Full Acknowledge

FKA

Formerly known as

FWIW

For what it's Worth

FYI / JFYI

(Just) For your Information

FTW

Fuck the World / For the Win

HF

Have fun

HTH

Hope this Helps

IDK

I don't know

IIRC

If I Recall / Remember Correctly

IMHO

In my Humble Opinion

IMO

In my Opinion

IMNSHO

In my not so Humble / Honest Opinion

IOW

In other Words

ITT

In this Thread

SMS language, textspeak, or texting language[1] is the abbreviated language and slang commonly used with mobile phone text messaging, or other Internet-based communication such as email and instant messaging.[2]

Features of early mobile phone messaging encouraged users to use abbreviations. 2G technology made text entry difficult, requiring multiple key presses on a small keypad to generate each letter, and messages were generally limited to 160 characters (or 1120 bits). Additionally, SMS language made text messages quicker to compose, while also avoiding additional charges from mobile network providers for lengthy messages exceeding 160 characters.

Once it became popular, it was often used outside of texting, such as formal emails or letters