A sex game.

Passing cum from person to person in such a way that the amount of cum increases.
Man cums in womans mouth, she spits cum into another womans mouth and a man cums in it too. She spits this into another womans mouth and so it goes on, back and forth till the last woman has to swallow a massive glop of cum. The "snowball" effect, see?
by top dog December 16, 2003
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A very kinky 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. It can also apply with two guys or a group with at least one guy involved (no duh).
Aftering Russell ejaculated in Kat's mouth they started snowballing.
by raspberry (lust) muffin June 8, 2005
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An exchange of semen during oral sex.

A guy ejaculates into his partner's mouth during oral sex, and then semen is passed back into the mouth of the guy who just ejaculated through kissing.

This can involve multiple partners, and the term can also be used when the guy who just came didn't know his partner was going to transfer his semen back to him.
Fred's girlfriend is giving him oral sex; she ejaculates and she gives him a big wet french kiss before she swallows. Fred's been snowballed!
by elementalangst May 20, 2006
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When an advantage causes that advantage to grow increasingly larger, typically with no hope of stopping it.
Bottom lane fed 5 times, and now Yi is snowballing out of control.
by Bo0m5l4ng February 15, 2016
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The difference between a snowman and a snow-woman.
Winter is nearly over, that snowman's snowballs are melting.
by JustThink4Once December 24, 2010
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You perverts got it all wrong. This is the REAL answer:

What a kid makes when it snows outside.
He rolls up a pile of snow,
packs it up into a ball,
and throws it at random people.
Mischevious Mike threw a record of seven-hundred and fifty-three snowballs at random people like hobos, ugly girls, and fat people.
by Anti-Pervert Dude January 12, 2008
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--To grow rapidly in significance, importance, or size.
"I should start of my homework assignments before it gets a chance to snowball."

"With the party I had to plan, and my mom pushing me to do this and that, the stress just snowballed!"
by Jroc44x February 5, 2005
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