Engineering is usually (practically always) on the receiving end of the dissing, so I can see why these might come in handy!
Some of the one's I've heard are
"Gym class! Gym class!" for Kin
"A,B,C,D,E,F,G... I just passed Humanities!"
"Soft sci! Soft sci!" for Social Sciences
"Plan B! Plan B!" for Social Sciences again
All the other ones I know are against engineering, bahahaha. And I'm sure you've heard those ones.