It can mean anything from they got together to they got together. Of course, this sentence means that a girl was kissing some guy in the dance floor. This is an oft-used sentence, since freshman girls have somehow been convinced that any guy who can open a Meister Brau with his teeth is SUCH a keeper. Judy got so drunk and hooked up with some guy last night. You'll hear this from Penn maidens, whose pasty-white upbringings convinced them that people west of 41st Street collect corpses of Long Island girls for their nightly orgies.
College is different.
This for most college students means pulverizing one's liver into something resembling the foie gras at the White Dog. Puking is a plus. He was so smashed. Though it is not the word of choice, the trend is to do both at once, so you're covered from that faux pas.