Much like the dick loogi. When a man ejaculates into the girls throat and instead of going down into her stomach with gravity it back tracks into her nasal cavity and out her nose in a thin trickle much like a bloody nose but only white
Example of a cummy nose
*this occurs while a man is "throat-fucking" a girl*
When the man finally ejaculates into her throat she doesn't turn onto her stomach in time and the cum goes down into her nasal cavity creating a white trickle out her nose (when she finally rolls to her stomach) looking like a white bloody nose.