Perciver is the portmanteau (slash) shipping name of Harry Potter characters Oliver Wood and Percy Weasley. The ship has been around for a long time, possibly since 1997, however it's fanbase is relatively small.
Oliver: Hey Percy, d'you want to *ahem* play Quidditch tonight?
Percy: But Oliver, you know I don't like flyin- OH! Er, er, right. Well yes, yes, definately.
Oliver: You know we have fangirls and they call us Perciver, right?
Percy: Yes, you showed me some of the stories they've written. Frighteningly accurate.