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1.
Sometimes shit-eating grin.

(1) n. A shit eating grin is a very wide and, to the outside observer, stupid looking grin, usually showing smugness, self-satisfaction, or inner humor. The term is most often seen in the expression "Wipe that shit eating grin off your face!", usually said by the aforementioned outside observer. This observer-based definition makes "shit eating grin" the negative counterpart to "You look like the cat who ate the canary." While the two expressions describe the same grin, they have very different connotations. This definition has nothing to do with the term "shit eater".

(2) n. Someone donning a forced smile in an uncomfortable, embarassing, or compromising situation could be said to have a shit eating grin. Because an uncomfortable situation is much more closely related to "eating shit" than smugness, it is plausible to assume that this is the first definition, although far from the most common, and that the above definition is a result of drift from this one.

Both of these uses are documented in the Oxford English Dictionary no earlier than 1957.
(1) Upon telling Elaine he knew a secret, Jerry donned a shit eating grin and refused to reveal it.

(2) Forced to admit defeat, the politician managed a shit eating grin as he called for and end to "bipartisan rhetoric".
por GuildNavigator84 08 de Fevereiro de 2006
 
2.
A smile indicating a joyous secret.
"You got the promotion! I knew there was a reason for that shit-eating grin."
por AbnormalBoy 02 de Setembro de 2004
 
3.
The smirk on one's face that makes you want to punch it.
Larry thinks he's funny with his shit eating grin.
por capnbarfy 27 de Maio de 2011
 
4.
A huge wide grin worn by a complete asshole after he just fucked you over. See NHL player Jarkko Ruutu
Left D "Ruutu hit me in the groin last shift, what a dick"
Right D: "Yea that shit eating grin on his face makes me want to wipe it off with my skate blade"
por Scotty Bones09 07 de Abril de 2011
 
5.
See: Obama
Obama's Shit Eating Grin can be seen from space.
por Happy Neff 10 de Setembro de 2012
 
6.
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.
por CheshireXstacy 25 de Junho de 2011
 
7.
having been invited to eat shit, one declines ... with a smile ...
wipe that shit-eating grin off your face ...
por lpdmontana 12 de Abril de 2010