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A statement used as an indication that another's action or statement immediately preceeding it sharply goes against the social norms of the group. The act must be of such an extreme nature as to cause hysterical disbelief or revulsion among members of the group. Obviously this is much stronger than calling a yellow card on someone.
"Yeah, she was so hot, I was ready to jump all over that."

"Dude, that's my sister, and she's only 15- Red Card!"
red card by Ben December 28, 2004
To overtly reject or deny.
Nick: "How did you get fired from your job?"
Danny: "My boss said I had to work on Saturday so I red carded him."
Red Card by Lil' Ahnotthebees!!! January 21, 2018
A girl gives a guy a red card when she has sex with him and doesn't tell him she's on her period.
My girlfriend gave me a red card last night. I had no idea she was on her period til i pulled out and freaked out.
Red Card by theclew August 27, 2013
A membership card for the union, Industrial Workers of the World
"Does that guy have a red card?
"Nope, he still thinks that politicians will change things.
red card by wobbly February 1, 2004
Having sex with a girl while she’s on her period.
I just fucked my girl while she was on her period I just got my red card
Red Card by HumanDictionary07 June 22, 2019
The act of giving someone a red card is usually to call out autistic behavior and to generate sexual tension
*Carson just grabbed Jerry's genetalia

Hey Carson, red card!
Red Card by Sniph me April 12, 2019