That's a funny anecdote, used in place of "lol" because 90% of the time, users of lol aren't actually laughing out loud.
Bliant: yo i saw the fattest girl today, she's definitely a yunhee!
Justin Timberlake: myspace is going to be the shit of all shit
Ashton Kutcher: tafa
what the fuck in short.
Tafa is that bitch doing here!?