SNOWBALL

A ball of snow, usually one made in the hand and thrown for amusement in a snowball fight; also a larger ball of snow made by rolling a snowball around in snow that sticks to it and increases its diameter.

A cocktail made from lemonade and advocaat.

Something that snowballs (grows rapidly out of control).

To rapidly grow out of proportion or control.

"The high unemployment rates quickly snowballed into a major budget problem for the government."

To play at throwing snowballs.

To pelt with snowballs; to throw snowballs at.