Meanings of "making out"
Making out is a term of American origin dating back to at least 1949, and is used to refer to kissing, including extended French kissing or heavy kissing of the neck, or to acts of non-penetrative sex such as heavy petting.
"making out" in lyrics
Finally, she is able to grasp the knife. Still watching Scarpia, she hides it behind her as she leans against the table. He has now finished making out the pass. He puts his seal upon it and folds the paper, and then, opening his arms, advances towards Tosca to embrace her.