To engage in the sort of sexual banter witnessed in such 70s and 80s cinematic juggernauts like "Pretty In Pink," "St. Elmo's Fire" or anything else starring Molly Ringwald and / or a song by the Psychedelic Furs.
"Dude, did dhe make out with Ducky? Nah, man... he got to first with Blaine though."
the act of swapping spit with your significant other... or perhaps just some hottie you met at a party, but anyway, you just sit there sucking at eachother's faces for an extended period of time and if you're lucky there might even be a little romming around of the hands if ya get my drift :p
Bob caught me making out with this dude at that party I wasn't supposed to be at cuz I told him I was sick...