BTW= by the way
AFAIK=as far as I know
HTH= hope this helps (or IHTH=I hope this helps)
FYI=for your information
YMMV=your mileage may vary (reach different conclusion)
Approximately a thousand others that you will catch on to after being here a while.
IIRC-If I remember correctly.
OTOH-On the other hand.
SCSW(AKA The Bible)-Standard Catalog of Smith and Wesson
JOMO-Just one man's opinion.
Just add water, makes it's own sauce- My personal favorite that means nothing.