"Paradise by the Dashboard Light" is a cool, looooooonnnnngggg song by Meatloaf where he describes how he made it with some girl in the front (or back?) seat of his car. It's a funny song.
For the Deephers at Pitt, our get ROWDY song is "Pour Some Sugar on Me" by Def Leppord. Even during between rounds at rush, I put on the song and we would get up on the sofas and scream the words. Effective way of letting off steam. And then, our official chapter song is "True Colors" by Cyndi Lauper. Usually, at every social event, we make a huge circle and exclude any guy there and just cry.
I think every sorority is cheesy in that way with one song. It's like the black pants rule - you can't be a true sorority girl without one.