[ابوعقرباوي]

LOL
laugh out laud

SOS
Sibling Over Shoulder

FTW
FOR THE WIN

WTH
What The Hell

BRB
be right back

ROFL
rolls On Floor Laughing

ROM
Read Or Memorize << im not sure about this one

RAM
random Access Memory

TYT
take yor time

MHz
megahertz

CPU
Central Processing Unit

TYVM
Thank You Very Much

OMG
oh my god

BTW
bay the way

WB
welcome back

YW
you are welcome

IMO
in my opinion

SWAT
Special Weapons And Tactics

DPI
Dots Per Inch

some of the shortcuts that you asked about it is not commonly used as a day language or chat or what ever
i have tried to help as far as my knowledge

if you have any other questions ,, fell free to ask