Calvin and Hobbes by Bill Watterson for May 18, 1989
Susie: Hi, Calvin! What are you doing, making paper hats? Can I make one, too? Calvin: Don't be ridiculous. This is the official chapeau of our top-secret club, G.R.O.S.S. - Get Rid Of Slimy girlS! Susie: "Slimy girls"?! Calvin: I know that's redundant, but otherwise it doesn't spell anything. Now go away. Susie: Girls aren't slimy! Calvin: Don't get gunk on me. I took a bath last Saturday and I'm all clean.