*NEW* "Hatt Ejrek bi May Berdeh" : Lebanese Slang, literally means "Put your feet in cold water", metaphorically means "dont sweat it out", or "don't worry about it".
Sample conversation:
Student 1: "I hope I will pass the test because my dad would crucify me alive if I don't graduate this semester"
Student 2: "man Hatt Ejrek bi May Berdeh, I gave you the right answers which I have stolen from the teacher's desk during the lunch break!"
In English means: "Dumb... and (still) walking". It is used to describe the foolness of a person who is completely unaware of what is going on around him/her. e.g.
Person 1: "Check out this car which just got out of the gas station!" Person 2: "OMG! the driver took off with the gas nozzle still inside!" Person 1: "...and he has no idea" Person 2 (laughin): "ghecheh w mecheh"