Obviously, this is a piece of cake, but…
this is NOT what I mean! If we say something “is a piece of cake”, we mean it is easy to do:
| Main Entry: | piece of cake |
| Part of Speech: | noun |
| Definition: | an easy thing |
| Synonyms: | breeze, child’s play, cinch, duck soup, kid stuff, pie, VISUAL THESAURUS |
It’s a piece of cake to say thank you with a cake! Watch this video.
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“YOU BUTTS” (at the end of the video) means, “You idiots!” It is short for “butt-heads”. Butt-Head is a fictional character from the MTV animated series Beavis and Butt-Head. He is oblivious to subtleties and marginally more “intelligent” than Beavis, although significantly less intelligent than the other characters in the show. 
butt·headn. Vulgar Slang. A person regarded as stupid or inept.
Helendipity 
Thank you for this piece of information. It was really interesting. I didn’t know that “duck soup” means “an easy thing” and I’m happy I’ve learnt it because “Duck Soup” by the Marx brothers is one of my favourite movies but I never quite understood the title!!
Glad it was useful. Thanks for the comment. I don’t think that idiom in particuar is very common anymore, but at leat now you know why the film had that name! I love that movie – it’s one of their best!