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shit-eating grin 

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.
shit-eating grin by hugepossum December 28, 2005

Shit-eating grin 

facial expression of those caught lying while not accepting resposibility
Despite the charges of corruption, Justin Trudeau again appeared before cameras wearing that shit-eating grin.

Shit-eating grin 

A stupid grin that makes you look so clueless that you enjoy eating shit on a daily basis without realising you're a complete putz.
People who call tech support don't even try to learn the basics of using a computer. I picture them sitting at their desk with a shit-eating grin, then headbutting the screen.
Shit-eating grin by Mikes_arse August 19, 2006

shit-eating grin 

having been invited to eat shit, one declines ... with a smile ...
shit-eating grin by lpdmontana April 12, 2010

shit eating grin 

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".
shit eating grin by GuildNavigator84 February 12, 2006

shit eating grin 

The smirk on one's face that makes you want to punch it.
Larry thinks he's funny with his shit eating grin.
shit eating grin by capnbarfy October 14, 2011