A particularly bad situation in which people seem to be unwittingly exacerbating things.
The Bush administration, a literal shit eating contest, the current job market.
by Jelly Mason July 10, 2014
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Any animal, monster, or thing that disgusts you upon seeing it
Girl: Did i miss anything in the movie? Man: Just a couple shit eating beasts
by Dick Sledge August 21, 2017
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A large , unhealthy individual who usually shows physical signs of poor lifestyle choices, outwardly aggressive in tone and manner and generally unsympathetic to the needs of others
That shit eating cunt just drove over that child’s dog and laughed about it, whilst on their way home from the takeaway restaurant
by Mrs Pussywillow November 26, 2021
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A)The grin on someone's face when they are trying not to smile but cant stop so they look like a total shithead.

called a shit eating grin because:

if you ate a piece of shit and you enjoyed it, you would naturally smile, but also try to hide that you enjoyed it at the same time, thus resulting in a "shit eating" grin.
"Wipe that shit eating grin off your face."

After John beat his friend Jim on a test, a shit eating grin came over him.

person 1 "Look at the size of that guys shit eating grin!"
person 2 "Man he looks retarded."
by Simmons12 August 2, 2006
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1. A huge smile that shit eaters can't stand(aka people who take themselves too seriously) When a serious butthurt occurs followed by a SEG said "victim" often flees to Urban Dictionary to bitch and moan about SEG's or someone wearing one. These whiners are often on the wrong end of the stick(no pun intended) and are too dull to grasp that their bitching only intensifies the "shittiness" of the grin. Naturally humiliation of the "victim" is in direct correlation to the "shittiness" of the grin.

In any situation it's best to be the person wearing a shit eating grin as opposed to the person who just ate shit. The person wearing the shit eating grin possesses both self-control and inner contentment concerning present circumstances. (possibly but not always at someone's expense) .

Many women love a shit eating grin, as it expresses the mystery of inner laughter as well as a completely unabashed authenticity regarding another person. All without blabbing on about some bullshit she probably doesn't care about.

A shit eating grin is one of the most powerful/sexy smiles in the world when expressed correctly.
Shit eating Jim and Butthurt Tom are walking on the sidewalk when Tom slips on a banana peal and falls on his ass. Jim flashes an enormous shit eating grin.
T: Wipe that shit eating grin off your face!
J: What grin?(while still smiling)
T: (silent)
J: (normal face) Alright Tom get up let's go.
T: No!!!! I'm going to go home and write an article about how butthurt your smile makes me feel!!!
J: (grins) o.k. Tom you do that.
by CheshireXstacy June 25, 2011
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A grin which someone crazy enough to be eating shit and be deliriously happy about it would have on their face.
I told Jimmy to wipe that shit-eating grin off his face before I smashed it into a pulp.
by hugepossum November 29, 2005
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