some times used to show amusement.
sometimes used to show that what the person is saying, doing, trying to do,or asking is complete unresonable on your standards.
Person 1:I am going to make the honor roles
Person 2:HA!
Like lol, it is meant to convey a laugh in texting and instant messaging, but unlike lol, you must actually have laughed before typing it. It also implies more confident laughter.
Basically it's a way to say lol, without having to say lol. It's great.
Text: After drinking last night, I had to throw up. So I tried to make it to the sink, but ended up puking on the linoleum floor, slipping in it, and falling down into a pool of my own vomit.
An interjection sometimes used when backdating an unwritten post while writing a month longblog about your reading of David Foster Wallace's Infinite Jest. It simultaneously expresses the poster's regret for not having written and also glee for having gotten away with it.