Definition of snowballs:
(n) :
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.
(n) :
(figuratively) Something that snowballs (grows rapidly out of control).
(n) :
A cocktail made from lemonade and advocaat.
(n) :
(US) A type of ice dessert: a snow cone.
(n) :
A small cake, typically cream-filled and covered in chocolate icing and desiccated coconut.
(adj) :
Of something with rapid growth, often uncontrolled. Compare snowball effect.