Lesson
"Give me a break" is something you say when you suspect that someone is pulling your leg or joking with you. It is also used when you don't believe what someone is telling you.
Example:
Matt: "My father makes 100 dollars per hour working at the sausage factory."
Lizzy: "Give me a break. Sausage makers don't make that much money."
Greg: "U2 is the best rock band in the world."
Sheila: "Give me a break. Just because they are the most popular doesn't mean they are the best."
Stuart: "If you don't do a good job on this report, the boss is going to fire you.
Max: "Give me a break. The boss would never fire me."
Vocabulary
To pull someone's leg: To joke someone.
To fire: To take away employment.