Dialectics of Runet

For a long time I read various texts on the Internet, incl. The notorious "Runet Quotes". I communicate for a long time in chat rooms, ICQ, blogs, forums and other similar places of mass communication of Internet users. There was a serious problem: people use slang in large quantities, without thinking about whether this jargon is understood by their interlocutor. I would like to establish clarity.

So, to establish clarity, I propose to collect a small dictionary of the Runet with general habrasilas, which will provide brief explanations of the expressions used in various media of communication on the Internet. I will try to start a similar dictionary for memory, and in the future I am waiting for your additions.

IMHO - in my humble opinion (from the English. In my humble opinion)
Mosk - the brain (from the phrase about aliens "They eat our mosk")
Blog - electronic diary (from English. We blog - electronic journal)
Post - blog entry
Comment - another person's post comment
Paxtol - literally: "Under the table," in the sense of laughter
LOL - literally: I laugh, I can not
LOL - imitation of laughter

lol is one of the reasons for writing this post. To my shame, I still have not fully understood the meaning of this short phrase. An option that seems to me the most reliable: English. laugh out loud . But there are problems with a fairly correct and semantically accurate translation and understanding of this English-speaking idiom. Therefore, the second request: explain your understanding and the origin of this phrase.
')
Like this. I am waiting for your additions to the dictionary, with translations (required) and an explanation of the origin (highly desirable).

Thank you all in advance. Establish the clarity of the dialectic of Runet together! :)