Definitions of snowball:

• noun:   snow pressed into a ball for throwing (playfully)
• noun:   ball of crushed ice with fruit syrup
• noun:   ball of ice cream covered with coconut and usually chocolate sauce
• noun:   plant having heads of fragrant white trumpet-shaped flowers; grows in sandy arid regions
• verb:   increase or accumulate at a rapidly accelerating rate
• verb:   throw snowballs at
• name:  A surname (very rare: popularity rank in the U.S.: #22621)