diary of a wimpy kid 1

chew out --- scold harshly, as in
Dad will chew you out for taking the car without permission.

copy off ---  to cheat in an examination, schoolwork etc by looking
 at someone else's work and writing the same thing as they have,
as in 
He's super easy to copy off of because he always finishes his tests 
early and then just puts his paper on the floor next to him while he
 reads a science fiction novel or something.

pipe down----to stop talking or making a noise, and become calmer
 and less excited
　Everybody pipe down. There's no need to shout.

diss /d'ɪs/ (disses dissing dissed)If someone disses you, they 
criticize you unfairly or speak to you in a way that does not show 
respect. (INFORMAL)
He believes that his records speak for themselves and ignores
 those who diss him.

Today I got totally dissed by Christine. I asked her if she would be
 my lab partner for Science and she told me she already had partner.

di·o·ram·a (dīə-rămə, -rämə) n.
A three-dimensional miniature or life-size scene in which figures, 
stuffed wildlife, or other objects are arranged in a naturalistic 
setting against a painted background.

in the doghouse --- in disgrace; out of favour
Dad was in the dog house for a long time after that one.

klutz /kl'ʌts/ (klutzes)
You can refer to someone who is very clumsy or who seems stupid 
as a klutz. (mainly AM INFORMAL)

someone who drops things and falls easily

For some reason Dad has it in his head that Rowley is a klutz and 
that he's going to break something every time he comes over.

corny   --- too silly and repeated too often to be funny or interesting

We were watching some corny movie Rowley had where there 
were these kids that taught themselves a secret language that only 
they could understand.

sombrero --- a Mexican hat for men that is tall with a wide, round brim ¹ turned up at the edges

babble --- to speak quickly in a way that is difficult to understand 
or sounds silly
　I have no idea what he was babbling on about.
incoherent --- not expressed or organized clearly, and therefore 
difficult to understand; speaking in a way that cannot be
 understood, because you are drunk, feeling a strong emotion etc

gibberish --- something you write or say that has no meaning, 
or is very difficult to understand
= nonsense
Rowley starts babbling all of this incoherent gibberish.

Rowley was so out of it he didn't really realize it was just a dream.
It means their not fully able to concentrate or participate in the 
surrounding events.

bug and tar
I made the mistake of using Brillo to rub off all the bugs and tar spots.

Mom and Dad couldn't peg it on me.

get away/off scot-free  (informal)

to avoid the punishment that you deserve or expect 
If you don't take out a complaint against him he'll get off 
scot-free!

chief cook and bottlewasher --- a person in charge of numerous 
duties, both vital and trivial, as in 
We have no secretaries or clerks; the department head is chief cook 
and bottlewasher and does it all.