having been invited to eat shit, one declines ... with a smile ...
wipe that shit-eating grin off your face ...
by lpdmontana April 13, 2010
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the black tooth grin is traditionlly deinfed as a popular pantera drink with a shot of wiskey and coca-cola. WRONG the black tooth grin is either a shot of jack daniels and coke not coca-cola, cocaine! Dime Bag would be rolling in his fucking grave if knew that people were mocking his favorite drink in such a horrendous way
I added some cocaine to my jack daniels and it gave me the black tooth grin.
by Adam Fultz August 22, 2007
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A toothy smile made by a jackass who just downed a 3 ponds of buffalo turds and still had particles of it on its teeth
by Bernard Dworkin July 29, 2003
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How assholes high-five themselves. Usually considered ingenuous by German culture due to their deep scholarly roots, but acceptable by Marxist liberals who let literal rats run the country.
I should have expected that vulgar language behind my back when I saw that shit eating grin.

When I came home to my dog I knew he had done something wrong from that shit eating grin.
by razzamatazibizzle April 7, 2018
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lowkey celebrating something you're satisfied with. especially with a personal accomplishment that doesnt mean much to anyone else, but makes you happy.
EFB: *makes a joke in a twitter comment*
other twitterer: ah, you beat me to it
EFB: damn i think thats the first that ever happened, sorry for your loss but imma grin a lil bit
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A forced, fake-looking smile you put on when you have to pretend you're enjoying something awful, like kissing your boss's ass. Counterpart to a shit eating grin, where you put on a big stupid smile, completely unaware of an uncomfortable situation you've created.
Bob told that dumbass Michael his presentation was great. You could see the ass eating grin plastered on his face.
by kickflipthecat July 28, 2010
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