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 31, 2005
 Get the crimson mudslidemug.
Get the crimson mudslidemug. 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 January 20, 2009
 Get the crimson turdmug.
Get the crimson turdmug. 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 May 14, 2018
 Get the Crimson Duvetmug.
Get the Crimson Duvetmug. by A Very Real Writer April 15, 2021
 Get the Crimson Generalmug.
Get the Crimson Generalmug. by hollyupa August 16, 2017
 Get the crimson mingemug.
Get the crimson mingemug. 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 23, 2011
 Get the crimson alliancemug.
Get the crimson alliancemug. Scott went banged ole Cock-eye while she was on her period. Then he slapped her with his crimson katana so her friends would know what happened.
by Bhuff24 December 25, 2020
 Get the crimson katanamug.
Get the crimson katanamug.