Alchie-grandma

An alcoholic grandmother or an older woman who drinks excessively.

Dang, my alchie-grandma drove her car into someone else's yard while on her way to the liquor store for more wine.

Dude, I love the alchie-grandma on 90210, she's such a biatch!

Kathy Griffin's mom is such an alchie-grandma, she always has a glass of wine with her.