If you get 'some of the face' it means that you have kissed someone. Or if you want some of the face then it means you would like to kiss someone. It is usually accompanied witha a swirling, sweeping, open-handed gesture circling your own face.
Dude #1 - Yo, how did you get on with that chick last night?
Dude #2 - Well, I got some of the face.
Dude #1 - Nice.