MPW is a new slang used bye mature audience defined as my pu**y wet it is described in a sexual way and used too define there vagina being wet and is usually said by a female who vagina is wet or soak
mpw is an acronym standing for the term "My Penis When" randomly used in some imageboards and irc channels, it shows a way to express yourself when your penis get shocked, impressed or in someway amused by any image, news or comments.
anon1: hey look another incredibly fappable moe-moe animu this season!!
anon2: >>mpw
5š 14š