Let's see...on our campus we've had.....
"TKE, rushing men and pleasing women since 1899" (I have this shirt too..heh)
"When we're good, we're good, when we're bad, we're better. ABC" (..or something like that, it's a Mae West quote)
"Have you ran over our mascot lately?" (Their mascot is a deer, lol)
My sorority had planned to have, "Lambda. Baadasses since 1973" But I b*tched enough about the "asses" part they gave up on it. Oh, the "baa" part is from our mascot, a lamb)
My fav of this year:
A local fraternity had their letters on the front of their shirt and on the back it said "Hey Mary, you're next" LOL!!