Cash me ousside, meaning "catch me outside", is a term meaning to go outside with someone and fight them, rather then doing it inside where they will cause too much commotion.
Billy: Cash me ousside howbow dah
Tommy: Ok let's go fight!
Sarah: Your so stupid looking in those uggs, yoga pants, crop top, and choker.
Hannah: Cash me ousside howbow dah
Sarah: Ok let's go! I just got my stiletto nails sharpened.
The use of the word "blue" to refer to sexually explicit content was first recorded in Scotland in 1824. "Blue" meant "lewd" because prostitutes dressed in blue gowns.