Les boules!

(une) boule = a ball.
And of course, as it should be expected, the word can refer to either:

• A round-shaped object, as in:
• "jeu de boules" also known as pétanque, very popular in the South of France where it was invented more than en century ago. Best enjoyed while drinking a chilled Pastis
  
• Faire boule de neige = to snowball, very literally since neige means snow
• An unmentionable part of the male body, which leads to a vey long list of expressions all worth knowing:
• Avoir les boules = to be upset, or scared. E.g. J'ai les boules! = I am pissed! or I am scared! (depending on the context)
  
• Foutre les boules = to upset/scare (someone). Foutre is slang for faire (and a lot more...)