"A lactivist is a lactation activist: someone who considers him/herself an advocate for breastfeeding, whether or not s/he's nursed. Lactivism comes in many forms: choosing to breastfeed, choosing to breastfeed for an extended period of time, choosing to breastfeed in public, choosing to smile at a breastfeeding woman, encouraging other women to breastfeed, educating the public on the benefits of breastfeeding, lobbying for pro-breastfeeding legislation, etc. Maybe you're already a lactivist, and didn't know it."

from A Call to Arms and Breasts by Stacey Greenberg

When you eat dirt for the first time and leave your family to build a shack in the woods

a woman who nurses her child in public as a protest against people uncomfortable with seeing breastfeeding.

Bunch of big-titted women that protested outside ABC's headquarters while their babies sucked on their large knockers.

A erson whom claims to be an activist on a cause but it's just empty words, as in lacking any enthusiasm, also known as an Armchair Activist.