What does ft mean from a girl?

When a girl asks "Do you want to ft?", it generally means she is asking if you want to have a video chat right now. According to online slang, "ft" is an abbreviation for "FaceTime", a video calling application. Therefore, the question is essentially inquiring if you're available and willing to video call using FaceTime. It can also be used more generically to mean video chatting on any platform. Someone might also say, "Hmu to ft," which means "Hit me up to FaceTime."