A boy I don't know called me fit, HELP?!?

Okay so I was on FB, and a boy I vaguely know (He goes to a different school) Sent me a message saying 'whoaa ur fit xxxxx' (copied exactly) he is kinda cute, and he asked for my number. He gave his to me first, so I texted him and such, I dunno if he's gonna ask me out or anything, I've never had a boyfriend, and my parents are really strict about boyfriends and things, (I'm in year 8) what should I tell him if he does? I don't wanna upset him..