cupcaking means flirting with another person doing anything leading up to, and excluding sex.
hugging, kissing, feeing up on the other person, and could be servicing (however that depends on the other party's definitions and boundaries of what cupcaking is)
To touch your self. A.k.a special time, alone time, smacking the meat, and touching your doodle. In order to make a white paste, like icing come out of your penis.
Bill was cupcaking in his room, when betty crocker walked in and sued him for copy right infringement.
adjective: a word used to describe the act of talking on the phone with a significant other with romantic or affectionate content, usually with funnycutenick names or words.