A cute saying to put on a school sweatshirt?

ok so my friends and i want to make sweatshirts that say something inappropriate but cly. we wouldn't wear these to school, just around with each other. we go to a catholic school so we want to make it a cute comment. were kinda like a clique so we will be the only ones with these sweatshirts. so i need something to say on the sweatshirt. btw our mascot in a friar