A Facebook slapper is a woman who is constantly sharing FB pictures of herself in "sexy" poses or "sexy" outfits, but who happens NOT to be the least bit sexy. The Facebook slapper usually has at least one Facebook friend (usally a gay male or a slapper girlfriend) who enthusiastically supports and encourages her in this endeavour, which onlyl causes her to continue sharing such pictures. For everyone else, the pictures serve as great entertainment, but not in the way the Facebook slapper intends.
"Lucinda is at it again. Take a look at what this Facebook slapper is wearing! A t-shirt which is too small for her, and also a bit see-through; her nips are the size of dinner plates!"
by Dabro May 16, 2012