OMG，If anybody call their wife '奶奶’in China，I think he will be punished .

There is an only meaning 。 "奶奶“is the mother of your Daddy。

奶奶means grandmother(your dad side) 姥姥or外婆means grandmother(your mom side) 妈妈means mom,妻子or老婆means wife

奶奶 means father's mom. if you wanna some funny meaning when you quarrel with others.you can say 姑奶奶 instead "我". for example,mom dont want this.(i dont want this):姑奶奶不要這個。

奶奶 means the mother of your father, and not the mother of your mother. Mothers side and fathers side family members in Chinese are different words.