Certain niche sites, such as Craigslist, spawn acronyms and abbreviations of their own. without ever wandering into the dubious provinces of the personals section. By logical extension, W4W and W4M means woman seeking woman, and. a transsexual, transgendered or transvestite person seeking men for an encounter; usually used in an online chatroom or in a personals ad. usually on craigslist. M4W Craigslist Meaning – Men-for-women / Men Seeking Women MC Craigslist Meaning – Missed Connections NSA Craigslist Meaning – No Strings Attached.