When one cums into an asshole. That person let's cum seep out into shot glass. Then puts cum back into their mouth. Spits the load back into the mouth of the person that originally came into the asshole and that person swallow his own load.
I busted my nut into their asshole they let the cum seep into a shot glass. Took the shot help the cum in their mouth. Spit the cum back into my mouth and I swallowed my cum. It's called a dirty snowball.
"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."
Similar to the reverse snowball however the load is depositted in the arse of reverse dirty snowballee. Post-deposition of said load, the girl sits on the reverse dirty snowballers face, allows the cooze to drip into the mans mouth and then french kissing is commenced to return the load to the girl.
Girl #1:He was eating me out, then decided to hit my ass but instead of just cumming in my ass, he pulls out and cums in my mouth and wasn't afraid to kiss me and take some of that cum back! Girl #2: He pulled an SWD dirty snowball! What did you say his name was again?
Hear me out--someone who has consumed so much cum (or jizz) that they have to vomit it back up. May also refer to when frosty the snow man drank too much orange juice and used himself as a projectile to punish the young whipper-snappers (probably Jeff).