"Far 7aleeb En Nawar" is an expression which literally translates to "the milk of the gypsies has boiled", lebanese slang.  Metaphorically it is used to describe a person or a situation that has become upset, or got tenser.  

 Sample conversation:

Person 1: "have you done this thing i asked you to do a week ago?"

Person 2: "oh no, i completely forgot"

Person 1: "you better do it today abel [before] ma yetla3 7aleeb en nawar"

"Zonc" is a technical word in the lebanese slang of youngsters used to express the idea of someone being stood up, or being had, i.e. getting to pay way over what you should for something.

Sample conversation:

Person 1: "so did you manage to take her out on a date?"

Person 2: "no man, 3atyetneh zonc"["she gave me a zonc"]

'3aja'it 3a Fassou7" is an expression which literally means "Fassou7 got crowded".  Fassou7 is an area in the Ashrafieh district of Beirut, previously (70's and 80's) known for its small little streets always jammed with cars and pedestrians.  The expression is used metaphorically to simply mean "It's getting crowded in here" whereever you are.  So you might be in the middle of shopping mall in Washington DC, you walk into a shop buzzing with people, and you would go "wow, 3ej'a 3a Fassou7".

Of course today, most roads in a metropolitan area such as Beirut are jammed.  But nevertheless, the expression stuck.

'Vu" is a word in french, was often used on homework assignments in lebanese french schools to mean "noted" or "reviewed", particularly on homework assignments which did not require any grading.  However, this word got into the lebanese day to day young population slang in the end of the 90's, to express agreement to a subject, understanding or simply noting of a remark.  If you are a fan of slang language, "Vu" is in fact very close to "Mesh Ghalat".

 Sample conversation:

Person 1: "What do you say we go to the beach today?"

Person 2: "Vu, great idea"