bf noun 4verb 1forms 6 noun4 •(Internet) Initialism of boyfriend.This bf style is sooo comfy; it's super oversized and the waffle material is ideal for all the chill days around the corner. PS: get the shorts, too. — 2023 •(Internet) Initialism of best friend. •Initialism of breastfeeding.The question I have is that my 3 yr old seems to show an interest in bf now that I'm bf the baby. — 1996 •Initialism of boldface. verb1 •Initialism of breastfeed or its inflections.I'm planning to bf my son until he is 6 mos. old. I've noticed from the postings that some bf their children well into the toddler years. — 1996 formsb-fed · bfed · b-fing · bfing · b-fs · bfs