Hello Deltabrat,
I know what you mean when it comes to those acronyms

. I always find myself sitting here trying to figure them out

. One (and notice I said One

)that I am familiar with (thanks to Salience

) is ROFL/ROTFL is "Rolling on (the) floor laughing".
Hope this helps, and I will keep checking this thread with hopes of learning more of these acronyms.
Have a good day & God Bless!