Um... so online communication is text-based, so people abbreviate stuff. A/s/l is "age, sex, location," which is a kind of outdated way of starting conversations on dating sites, "lol" stands for "laughing out loud," and "wtf" is "what the fuck." Like Whiskey Tango Foxtrot, if your military does the phonetic alphabet thing.

[She shrugs.]

The internet is a big weird place and once you get home you luckily won't have to worry about it.