Thank you very much Fred

my second question (there are a lot more to come, i'm afraid):

frat boy - is it a student or is there any insult in it? he is called pickled frat boy.

Thanks again

pickled frat boy = drunk boy who belongs to a fraternity

is pickled a slang for drunk? because I couln't find any other meaning to this word besides the pickles that we eat.
Can you say that a frat boy is a student? is it the same age of students, or college boys?

and thank you again

Yes. 'Pickled' is slang for drunk. Frat boys are college students.