look up any word, like dirty sanchez:
 
5.
having sex with a woman while on her period
I was in the red last night
by K Siler June 17, 2005
 
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."
by Jarik March 31, 2005
 
2.
having an easily aroused and uncontrollable boner. usually happens a lot when you're adolescent teenager. all men can have it though at anytime.

also see N.R.B.
Guy #1: Why are you covering your crouch with your notebook?
Guy #2: Because man, I'm still in the red!

Guy #1: Aww man, Jen's coming down the hall.
Guy #2: Ah, shit! I'm gonna be in the red til the end of school!
by thephantomplatypus September 24, 2009
 
3.
A state in which the battery power in one's iPhone dips to 20% or less, causing the battery icon in the top right corner to change color from green to red.
I'd better charge my phone. I've been playing Tetris for hours and now it's in the red!
by OneMileFromGlory April 26, 2014
 
4.
Mad, pissed off, so furious your face turns red.
He slammed the change down on the counter and I was in the red.
by Sherlee June 05, 2007