Yeah, I know what "ficar" means. Most of the times it means you to stay with a girl (kissing) but in a no too serious relationship, ya know ? Sometimes kissing and something more.
You can "ficar" for 1 day, 2, 3, 1 week, 1 month. I never did this, since I'm 19 and with my girlfriend for 3 years, 9 months and 13 days
It's very normal. You can "ficar" in a bar with a girl you never meet before, in a beach or somewhere else. In portuguese is "Quer ficar comigo?". "gimme a kiss" is "me dá um beijo".
Now to go her and work this out. If you need some more translations just ask me, good luck