A baby born whilst her/his mother is on her period. Thus, when s/he is born, she is covered in blood. The effect is especially pronounced on children born to women with heavy flows.
Someone who coughs up blood due to smoking too much, or smoking using a bad smoking apparatus. Generally, the bleeding is caused by a popped lung or some sort of airway drying.
Other people who are blood coughers are heavy alcoholics and cannibals.
"Hey dude, see the game last night?"
*Dude coughs up blood.*
"Awe fuck you blood cougher, go to the hospital."
During a womans period, she thinks she is just going to queef but finds that, during the process, blood has been expelled from the vagina and wet drippy feces from the anus.
"Oh god karen, I knew I shoulda held that queef in. Now I just soiled myself with a blood shweef."
The act of checking your face to see if you're bloodied. Whether it's rooting around in your mouth to see if you've loosened a tooth or checking your fingertips for blood after taking a hit to the face. Commonly used among hockey players.
"Damn, Probert really had a go at him. Look, he's pulling a bloodcheck. Why even bother?"