Parent involvement key to keeping kids safe online. These days, kids let their fingers do the talking, instant messaging or texting their "BFF's" at any time of the day or night. BFF is "best friend forever" in Internet shorthand. ... Do you know what "POS" means in kid lingo? That's "parent over shoulder." Don't worry, the three dads we asked didn't know either. We stumped another mom with "ASL." That's "age-sex-location," a phrase swapped liberally throughout the Internet when strangers meet.