Pierwsze i najszerzej rozpowszechnione: OK - This may be the most universal word in existence; it seems to have spread to most of the world’s languages. Etymologists now generally agree that it began as a humorous misspelling of “all correct": “oll korrect.” “OK” without periods is the most common form in written American English now, though “okay” is not incorrect.(to ze strony common errors in english)
2) laughing out loud - LOL
3)in my humble opinion - IMHO
4)by the way - BTW
5)rolling on the floor laughing - ROTFL
6)away from keybord - AFK
7)talk to you later - TTYL
8)wait - W8
. . .