Crap-eating

Someone who walks around with a perpetual sneer on their face, thinks they're better than everyone else and makes fun of people in the most vulnerable ways possible to give themselves a feeling of superiority. This expression works best when used as a submodifier for other derrogatory words like faggot, ass, boot-licker or bonehead.

Will: Evan, I am sick to death of your attitude. You even criticise and make fun of people much older than you. You think you're God's gift to the Earth. Even the way you walk makes me sick.
Evan: What do you want from me man?
Will: Just be polite! Is that so hard, you crap-eating faggot?

I must ask you to eat crap sandwiches, you Malthusian monkey molester

"I must ask you to eat crap sandwiches, you Malthusian monkey molester," is the definitive, empirically tested retort which wins an argument forever, and for which no come back is possible.

Edbogard: .. and so I think that Sartre was essentially in error when he mistook the homology between ontogeny and...

Pasco: Arrgh! I can't take it any more! I must ask you to eat crap sandwiches, you Malthusian monkey molester!

Edbogard: I...

*thud*

eat crap munch scat

exactly what it says

Willy P: I eat crap munch scat
Everyone else: yeah you do