"I think I'm drunk!" (I imagine this to be said early on, such as during the first hand-washing or something.)

"When do we get to eat? I'm horny." (horny, hungry - whatever.)

"Our matzo is the VERY BEST [insert specialty brand name] from Israel, where they drive [insert name of fashionable sports car here]."

...and the one I actually got to hear at the seder I attended last night (though not from a sorority or fraternity person):
"This gefilte fish better be good - it's gold label!"