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A lactivist is someone who thinks breastfeeding is the best thing since sliced bread and won't stop talking about it, even if they've never nursed a baby in their life.
I saw a lactivist yell at a man for taking a picture of her nursing in a coffee shop.
My boss is a lactivist. She talks about breast milk like it's a superpower.
A lactivist once tried to start a petition to make pants optional in public places.