What is In The Red?
1.
business term meaning having a negative amount of money
"James is horrible at selling things. If everyone were like him we'd be in the red in no time."
2.
Mad, pissed off, so furious your face turns red.
He slammed the change down on the counter and I was in the red.
See
3.
having sex with a woman while on her period
I was in the red last night