The whole plot is based on three members of Kappa Omicron Kappa (not exactly a subtly acronym) getting kicked out of their fraternity after they were set up and accused of stealing the alumni party funds. They need to sneak back in their old house to recover a videotape that will prove their innocence. Their first scheme is to dress up as girls and get in during a party, but they quickly get ejected by the "dog catcher" whose job it is to get rid of ugly girls. While still in drag, they are invited to pledge the ultra-feminist Delta Omicron Gamma sorority (another non-subtle joke) and, since they've no food, money or lodging, they accept. The rest of the movie is about their awkward attempts to keep up their ruse and fit in with a bunch of sorority girls, all the while scheming to get back that tape. Naturally, much of the laughs come as the "girls" are forced to adjust to their new roles and dealing with stuff like leg shaving and walking (badly) in heels, although in the process these formerly crude horndogs learn to start appreciating women as more than just object to either lust after (if they're hot) or make fun of (if they're not).
Fortunately, they don't get too heavy on the feminist "message" stuff, at least not enough to get in the way of the humor. And there's a fun little love twist in which one of the boys starts falling for the sorority president, Leah. Her character's a bit of a modern movie cliche, like Julia Stiles in "10 Things I Hate About You" she's supposed to be this bitchy, angry, ugly man hating feminist but is simply too good natured and good looking to really fool anyone. Of course, the twist is, as a boy (in her Women's Studies class) she hates him, but as a girl, she starts to develop feelings for "her". Naturally, once she learns the truth she's initially outraged, but seeing as this is a simple comedy and not something like "Chasing Amy", she quickly relents and all ends well. This is by no means a great comedy, it's definitely a "rent, don't buy" kind of movie, but considering I had no real expectations other that to get about 90 minutes of shut-off-your-brain entertainment, I must say it wasn't bad.