noun
woman used as a sexual object; female human toilet
Extremely vulgar and derogatory slang; a pun on 便所 (toilet). Used to refer to a woman treated as a sexual object or literally as a human toilet in degrading contexts.
その掲示板では、女性を「便女」と呼ぶようなひどい書き込みがあった。
On that forum, there were awful posts calling women 'benjo' (human toilets).