I guess this can not be a good one, but I think i'll help.
I entered in an international chat: http://www.teenchat.com, it's good, but don't add any girl because they'll send you a lot of virus, it's just good to talk to them at there, but returning, and in the first time a girl asked me: "ASL?"
And I said:"What is it?"
But incredibly politely she said, it's not normal because Americans are a lot closed, "It's Age, Sex and Location".
So, it's just it, ASL is AGE, SEX AND LOCATION, that they are asking to tell them.