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1.
"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
She and her friend are both lactivists.

"Breastmilk is best for all babies" said Susie, a lactivist from Central City.
by Lactivist Intactivist January 07, 2006
 
2.
Breast-feeding fanatics!
Lactivists wouldn't mind their NIP-s (nursing in public) seen!
by hammer---;, hytham April 11, 2007
 
3.
a woman who nurses her child in public as a protest against people uncomfortable with seeing breastfeeding.
Lactivists staged a nurse-in outside a restaurant to protest women being refused service after breastfeeding inside.
by pharmer on the dell June 07, 2005
 
4.
Bunch of big-titted women that protested outside ABC's headquarters while their babies sucked on their large knockers.
Unfortunately, I'm too old for breast-feeding. Guess I'll just have to watch babies. :)
by Parkin' Lot Pimpin' June 10, 2005