Feel Up Meaning

(idiomatic, transitive) To grope someone in a sexual manner.

Example: 2009, Arlene Gorey, My Spanking Diary - Page 28
  â€œFeel me up and rub your pussy against mine, that'll make the pain in my bummy go away, it will,” she told me. I felt sorry for her. And I guess that's why I let her show me how girls made out without boys.