If you are in the doghouse, you are in trouble with your spouse and/or family - imagine a husband whose wife is so mad that she locks him out of the house and he has to spend the night in the doghouse with the family dog.
"You" is not an idiom. It is a pronoun.
to support
This expression means real and simple.
pleasant and easy....
It means to get married.
It means that is the essence of it. Similar to the expression 'in a nutshell'.
a mass where prayers are sung
i believe it means: to hope that...
Go nuts; crazy.
timid,coward
In this idiom, "He has a big head" means that the person is arrogant or conceited. It suggests that the person thinks highly of themselves and may not be humble.
stop doing what you're doing