An act where cum is passed from one person's mouth to another's mouth.
Faye would only give Kev a blowjob if he agreed to try his own cum, they ended up snowballing as Faye's great at blowjobs and Kev didn't want to lose out
Like a snowball rolling down a mountain, growing ever larger as it continues toward the bottom, a wikipedia snowball occurs when one researches something on the wikipedia, only to then click link after link into subsequent articles of interest until, suddenly, several hours have passed.
Jim: "I'm sorry I'm late, I got caught in a wikipedia snowball. I was looking for information on the new James Bond movie and suddenly four hours had passed. On the bright side, now I know what happens in Marvel Zombies, I can tell you how astronomers gauge the temperature of stars, and why World War I started."
A sexual game when after someone has had sperm ejaculated into their mouth they hold it orally rather than spitting or swallowing, then french-kiss with their partner.