Having vaginal intercourse with a girl on her period. Followed by anal sex with a penis still covered in period juices.
"My friend got weirded out having sex with a girl on her period, so he flipped her over and gave her a crimson mudslide"
by Hugh Gass August 06, 2005
when you think your period is over and you take a hugeeeee shit and you look in the toilet and see red blood swarming your shit. AKA You got your period back dammit!
by kritio October 10, 2008
by poohh clan March 20, 2021
when a menstruating girl straddles a man's face and fanny farts the clots and gunk all over his mush
by uprightuk September 08, 2010
Dude1: Man, is it just me, or were all those bitches acting crazy?
Dude2: I don't know man, they must have formed a crimson alliance or something.
Dude2: I don't know man, they must have formed a crimson alliance or something.
by ossel September 24, 2011
by A Very Real Writer April 15, 2021
The act of a man cumming inside of a woman's vagina while she is on her period and having the mix of blood and cum drip onto the bed spread.
Suzie was pretty excited over her new comforter, but when I gave her the Crimson Duvet she got pissed and said I ruined it.
by Tall and Long March 22, 2018