when you eat your own cum out of someone else's ass and they don't use mouthwash
"I didn't dirty snowball' Sarah because it wasn't my cum, I'm a virgin. I just kissed her after she licked another man's asshole, without using mouthwash."
when you kiss someone (lovingly) after eating your own cum out of their ass
"that wasn't a dirty snowball, the kiss wasn't loving, and it was someone else's cum."
when you kiss someone (lovingly) after eating your own cum out of their ass
jack and five others had a dirty snowball fight