Buttface

Since we seem to be gittin' into some slightly more narsty pet names... My sister called her ex-husband "Butt Face" (maybe that's why he's an "ex" now.)

"You've made your point, buttface," Allen snarled. "Now let me make mine."

"Okay, he's a buttface," says Darryl, pleased with his cleverness. "That's it!" shouts his mom. "You're in your room for the rest of the day."

"You're not making this easy, Kyle! My name's Peter Griffin, I'm a big, fat, dumb buttface!"

"Who's Jamal?" "My friend. Don't you have any friends yet, buttface?"